Restored by Resolution: The Southern Ocean's Missing Seventy Years

The Traveler's Panel · checked 22 August 2026

Changing information. Prices, permits, seasons and road access change, sometimes at short notice. Everything here is a starting point for your own confirmation — not a quote, and not a guarantee. Verify with the operator and the relevant official body before you book.

Getting there — Ushuaia → Cape Horn → Drake Passage → 60°S → South Shetland Islands (about two days at sea)

1. Almost everybody arrives the same way. Fly to Ushuaia, at the southern end of Tierra del Fuego, board a vessel, and sail south past Cape Horn into open water. IAATO's own figures for 2025–26 put 98 per cent of tourism voyages in the Antarctic Peninsula region, departing from Ushuaia or, less often, from other ports north of the Antarctic Treaty Area. That is 579 voyages across 68 ships and yachts operated by 51 companies in a seven-month season running October to April.
2. The crossing itself is the thing. From Cape Horn to the South Shetland Islands is roughly four and a half degrees of latitude of unobstructed Southern Ocean, and the State Department's advice is unusually plain for a government document: prepare for rough seas, expect big waves and strong winds. Two days out, two days back, is the standard shape of it.
3. Somewhere in the middle of that, the ship crosses 60°S. Nothing marks it. What changes is the legal regime: south of that parallel the Antarctic Treaty applies, and in the United States the Antarctic Conservation Act's prohibitions on waste disposal, damage to historic sites and interference with native wildlife come into force. Private expedition organisers must notify the State Department at least three months before departure; commercial operators normally handle this for their passengers.
4. There is a way to skip the water entirely, and a meaningful minority take it. Fly-cruise itineraries leave from Punta Arenas in Chile and land at the airstrip on King George Island in the South Shetlands, at 62°S, joining a ship there. Passengers on those voyages enter the Southern Ocean by aircraft and never see the Drake Passage. We could not establish from any source we opened what share of the season's traffic this represents.
5. The Ross Sea and East Antarctic sectors are reached from Hobart, Lyttelton and Bluff, and are a different proposition entirely — longer, colder, far fewer vessels, and in most seasons a small fraction of the Peninsula's numbers. Nothing in this dossier's practical notes applies to them.

Indicative costs — verify before booking

What to pack

• Medication for seasickness, taken before departure rather than after. The Drake Passage is the single most reliably unpleasant part of the itinerary and the official advice is to expect it.
• Clothing for open ocean in the low sixties of latitude, not for a shore excursion. The deck is where the crossing is actually experienced and it is wet, cold and windy for most of two days.
• Binoculars that survive salt spray. The front, when you cross it, is invisible; the seabirds that track it are not.
• Nothing you would object to declaring. Biosecurity checks on boots, bags and pockets before landings are a permit condition, not a courtesy.
• Realistic expectations about the announcement. When the tannoy says you have entered the Southern Ocean, it is reporting a parallel of latitude, not a change in the sea.

Where to stay

There is nowhere to stay in the Southern Ocean, which is the honest answer, and it is not a flippant one: the crossing is spent aboard, and the ship is the accommodation, the transport and the only shelter within several hundred kilometres. Ushuaia at the northern end has the hotel stock, and Punta Arenas serves the fly-cruise departures; south of the line there are national research stations, which are not accommodation and should not be approached as though they were. The seasonal shape of it is worth understanding before booking. IAATO counts 112,894 vessel-borne visitors across the 2025–26 season and estimates around 105,459 for 2026–27, which sounds like a crowd until it is divided by 579 voyages across seven months and an ocean; in practice a vessel in the Drake Passage is usually alone on the horizon, and the congestion, where it exists, is at a handful of Peninsula landing sites rather than on the water this dossier is about. Anyone choosing between the two-day crossing and the flight to King George Island should know that they are choosing whether to experience the thing the name refers to.

Safety & responsible travel

• Do not repeat the line that the Southern Ocean was recognised in 2021 by a magazine. The instrument is IHO Resolution 2/2023, adopted at the Third Assembly on 3 May 2023, and the distinction is the whole point.
• Be careful with the word 'natural' about 60°S. The IHO's own proposal derives it from charting region M4, and the resolution's own recitals say the limits concerned have neither political nor oceanographic nor, more generally, any environmental significance whatsoever.
• Do not report the 2023 decision as unanimous or as consensus. The chair acknowledged there was none; Argentina objected on the record and asked for its position to be annexed.
• Observe the landing rules south of 60°S as permit conditions rather than guidelines. The prohibitions on waste, wildlife disturbance and damage to historic sites carry civil and criminal penalties in several jurisdictions.
• If you write about the naming dispute in the north-west Pacific that helped end S-23, report the procedure and not the merits. The IHO's own record says only that no consensus was reached.

Nearby, and quieter

North of the line, and therefore outside the Southern Ocean as the IHO now defines it, South Georgia sits at 54°16′52″S — south of the Antarctic Polar Front for most of the year, inside the CCAMLR Convention Area, and outside the Antarctic Treaty Area, which is a compact demonstration of how little the three official boundaries have to do with one another. South of the line, Elephant Island at 61°05′S is the first land on the eastern approach and the least visited of the significant landfalls; King George Island at 62°S carries the airstrip and the densest concentration of national stations in the region; and Deception Island at 62°57′S, a flooded volcanic caldera a ship can sail into, is among the most heavily visited sites in the Peninsula. Cape Horn, at 55°58′48″S, is the other bookend: the last land before the passage, and the reason the passage has the reputation it does.

Getting there, in order

• 1Ushuaia
• ↓
• 2Cape Horn
• ↓
• 3Drake Passage
• ↓
• 460°S
• ↓
• 5South Shetland Islands (about two days at sea)

Each leg is a separate booking and a separate chance to be weathered out. Build spare days into the chain, not onto the end of it.

Where it is

Drake Passage and the 60°S line, Southern Ocean · 59.0000°S 62.0000°W · Open in Google Maps · OpenStreetMap

Key locations

• Ushuaia — departure port for the great majority of Drake Passage crossings (GeoNames)
  54.8108°S 68.3158°W
• Punta Arenas — secondary gateway and base for fly-cruise departures (GeoNames)
  53.1628°S 70.9092°W
• Cape Horn — last land before the passage (GeoNames)
  55.9800°S 67.2892°W
• 60°S on the Drake Passage track — not a gazetteer feature: a point on the declared northern limit of the Southern Ocean
  60.0000°S 62.0000°W
• Elephant Island — first land south of the declared limit on the eastern approach (GeoNames)
  61.0847°S 55.1842°W
• King George Island — airstrip and national stations; the fly-cruise landfall (GeoNames)
  62.0000°S 58.1000°W
• Deception Island — flooded caldera, among the most visited Peninsula sites (GeoNames)
  62.9500°S 60.6328°W
• Grytviken, South Georgia — north of the IHO limit, south of the Polar Front, inside the CCAMLR area (GeoNames)
  54.2811°S 36.5092°W

Coordinates are for orientation and are accurate to roughly the width of the feature named, not to a doorway. Several of these points are inside protected areas or need a permit, a guide or a boat — read the access notes above before you plan a route to any of them.

Sources & further reading — checked 22 August 2026

1. International Hydrographic Organization — A3/2023, PRO-3.3, 'Recognition of the Southern Ocean and consequences on the limits of some global sea areas', submitted by the Secretary-General as HCA Chair. The sentence that the Southern Ocean 'became an official ocean in 1937, but lost its official status in 1953'; the draft resolution recognising the Southern Ocean as the global sea area surrounding Antarctica with a northern limit at 60°S; and the express derivation of that limit from the established northern limit of IHO INTernational Charting Region M4
2. International Hydrographic Organization — A2/2020, PRO 1.9, 'Report on the Informal Consultation Process for the Future of S-23'. The ten member states that expressed interest in summer 2017; two informal consultative meetings with the DPRK, Republic of Korea and Japan, with the USA and UK as observers; that 'Both exercises did not result in new suggestions how to revise S-23 successfully'; PRO 1.9.2 tasking a dataset using unique numerical identifiers only; and 'No Consensus was reported'
3. International Hydrographic Organization — Decisions of the 3rd Session of the IHO Assembly, 2–5 May 2023. Decision No. 19 in full: the Assembly approved the proposed IHO Resolution on the recognition of the Southern Ocean, took note of the consequences on the limits of some global sea areas, and endorsed that the resolution is without prejudice to the views of the IHO, any other international body or any IHO Member State. No voting method is recorded
4. International Hydrographic Organization — Summary Record, Fourth Plenary Session of the Assembly, 3 May 2023 (IHO-A3-SR4). The debate on PRO 3.3: Australia, Chile, Norway, Germany, the UK, the USA, New Zealand and France in favour; Argentina finding 'no technical, scientific or hydrographic grounds'; India and Uruguay urging delay; and the chair 'while acknowledging the lack of consensus' emphasising that the majority of speakers had supported the proposal
5. International Hydrographic Organization — Decisions of the 2nd Session of the IHO Assembly (A-2 DECISIONS), 16–19 November 2020. Decisions A2/23, A2/24 and A2/25: the Assembly took note of the Secretary-General's report on the informal consultation process for the future of S-23, approved the PRO 1.9 proposal 'made as a package', and tasked the Secretary-General with its implementation
6. International Hydrographic Organization — Final Summary Records of the 2nd Session of the IHO Assembly, 2020. That the Assembly combined three virtual session events with fifteen decisions made by correspondence, an arrangement the chair called 'a novum not foreseen by the Assembly Rules of Procedures'; 65 member states in attendance for quorum; and the chair's statement that approval would 'bring a positive closure to the debate on naming issues'
7. International Hydrographic Organization — M-3, Resolutions of the IHO (edition of July 2026). The standing resolution register, listing Resolution 2/2023, 'Recognition of the Southern Ocean and consequences on the limits of some global sea areas', adopted at IHO A-3, alongside Resolution 32/1919 as amended on the Limits of Oceans and Seas (S-23)
8. International Hydrographic Organization — M-1, Basic Documents of the IHO, Edition 2.1.3, January 2024 (Convention on the International Hydrographic Organization). The Convention text, signed on the third day of May 1967, stating that the Organization 'shall have a consultative and technical nature' — the mandate Argentina invoked in 2023 — and the amended Convention's entry into force on 8 November 2016
9. International Hydrographic Organization — S-4, Regulations of the IHO for International (INT) Charts and Chart Specifications of the IHO, Edition 4.10.0, March 2026. Section A-204.8 on INTernational Charting Regions and the chart-numbering allocation table, in which Region M covers the Antarctic with chart numbers 900–929 and 9000–9199, and the region diagram extends to 60°S — the source of the Southern Ocean's northern limit
10. International Hydrographic Organization — S-23, Limits of Oceans and Seas, 3rd Edition, 1953. The publication itself as the IHO keeps it: a scanned reprint carrying the imprint 150-XII-1971, with 'See Correction Page at the end of the document', a corrections section for pages 12 and 13, and no machine-readable text layer, so its body text could not be extracted by us
11. IHO Geospatial Information Registry — S-130 Polygonal Demarcations of Global Sea Areas, product specification record. Edition 2.0.0, published 2025-10-28 as the first operational edition; a vector product specification 'primarily intended for encoding the extent of global sea areas using a system of unique numerical identifiers only'; scope given as global; producer the IHO
12. International Hydrographic Organization — Standards and Specifications page. The IHO's own catalogue confirming that S-23 remains published in its 3rd Edition of 1953 with downloadable component sheet maps, that S-4 is current at Edition 4.10.0 of March 2026, and that S-130 Edition 2.0.0 dates from October 2025
13. International Hydrographic Organization — 3rd Session of the Assembly (2023) event page. The dates and venue of the Assembly at which the Southern Ocean was restored — 2 to 5 May 2023 at the Grimaldi Forum of Monaco — used here to settle the session number and date against a summary record whose extracted header rendered them inconsistently
14. International Hydrographic Organization — 2nd Session of the Assembly (2020) event page. That the Assembly which approved the S-130 package was held on 16–19 November 2020 and was 'Planned as a digital event' — the format that produced decision-making partly by correspondence
15. International Hydrographic Organization — Assembly index and document archive. The navigation record used to locate the summary records, decisions and proceedings of the 1st, 2nd, 3rd and forthcoming 4th sessions of the Assembly, and the P-6 proceedings volumes for the 3rd session
16. International Hydrographic Organization — 3rd Assembly circular letters and documents index. The full list of A-3 documents, including the six draft summary records by plenary session, the decisions document and the P-6 proceedings volumes 1 and 2 — the route by which we found the record of how PRO 3.3 was carried
17. United Nations Group of Experts on Geographical Names — GEGN.2/2025/157/CRP.157, Report of the International Hydrographic Organization, 11 March 2025. The IHO reporting to the UN naming experts that S-23 is 'a well-known publication frozen in its 3rd Edition since 1953', that the Southern Ocean is recognised as the sea area surrounding Antarctica with a northern limit at 60°S, and that S-130 'will use a system of unique numerical identifiers only'
18. United Nations Group of Experts on Geographical Names — GEGN.2/2023/132/CRP.132, Report of the International Hydrographic Organization, 30 March 2023. The IHO liaison officer's report to UNGEGN dated five weeks before the Third Assembly, flagging the pending Southern Ocean proposal because the name 'is largely used by geographers and the scientific community', and describing the agreed S-130 replacement
19. Freeman, N. M. and Lovenduski, N. S. — 'Mapping the Antarctic Polar Front: weekly realizations from 2002 to 2014', Earth System Science Data 8(1), 191–198, 2016. Twelve years of weekly satellite mapping of the Antarctic Polar Front: the mean path is asymmetric and spans 44 to 64°S; sea-surface temperature at the front ranges 0.6–6.9°C; mean intensity 1.7°C per 100 km, ranging 1.4–2.3; intensity correlates with bottom topography
20. Intergovernmental Panel on Climate Change — AR6 Working Group I, Chapter 9, Ocean, Cryosphere and Sea Level Change. That the Southern Ocean 'accounted for around 75% of global ocean heat uptake during 1870–1995' and that 35–43% of upper-2000 m global ocean warming occurred there over 1970–2017, rising to 45–62% for 2005–2017, assessed with high confidence
21. Commission for the Conservation of Antarctic Marine Living Resources — Convention Area. CCAMLR's published boundary in full: a stepped line from 50°S 50°W east to 30°E, north to 45°S, east to 80°E, south to 55°S, east to 150°E, south to 60°S, east to 50°W; a surface area of 35,716,100 km², around ten per cent of the Earth's oceans
22. British Antarctic Survey — The Antarctic Treaty. That the Antarctic Treaty 'covers the area south of 60°S latitude', that it came into force on 23 June 1961 after ratification by the twelve countries then active in Antarctic science, and that forty-six countries have acceded to it
23. Australian Antarctic Program — Law and treaty, and CCAMLR. That the Convention on the Conservation of Antarctic Marine Living Resources came into force in 1982, that it requires decisions on rational use to rest on an ecosystem approach considering all species and ecological relationships, and that it is headquartered in Hobart
24. US Department of State — Antarctica International Travel Information. That Antarctica covers 'everywhere south of 60 degrees south latitude, including waters and islands around Antarctica'; Level 2, Exercise Increased Caution; the Antarctic Conservation Act's prohibitions; the instruction to prepare for rough seas in the Drake Passage; and the three-month notification requirement for private expeditions
25. NOAA National Ocean Service — 'How many oceans are there?' (last updated 16 June 2024). A US federal explainer, updated more than a year after IHO Resolution 2/2023, still stating that the Southern Ocean's boundaries 'were proposed to the International Hydrographic Organization in 2000' and that 'this has yet to be ratified by members of the IHO'; and that the US Board on Geographic Names recognises the ocean from the coast to 60°S
26. United States Geological Survey — U.S. Board on Geographic Names. The Board as 'a Federal body created in 1890 and established in its present form by Public Law in 1947 to maintain uniform geographic name usage throughout the Federal Government', under Public Law 80-242, 43 U.S.C. §364, with a Foreign Names Committee served by the NGA
27. National Geographic — 'There's a new ocean now — can you name all five?' (8 June 2021). The announcement itself, cited only as an announcement: National Geographic's own recognition of the Southern Ocean from World Oceans Day 2021, its Society geographer Alex Tait on ecological separation and the Antarctic Circumpolar Current, and the note that the IHO had not then reinstated the name
28. International Association of Antarctica Tour Operators — 'IAATO Overview of Antarctic Vessel Tourism: The 2025-26 Season, and Preliminary Estimates for 2026-27', ATCM IP 200 rev. 1, 9 May 2026. 112,894 vessel-borne visitors in 2025–26 across 51 operators, 68 ships and yachts and 579 voyages; 85,195 landed and 27,217 cruise-only; 98% of voyages in the Peninsula region between October and April, departing Ushuaia or other ports north of the Antarctic Treaty Area; and about 105,459 estimated for 2026–27
29. International Association of Antarctica Tour Operators — Data and statistics. The headline 2025-26 season counts as IAATO publishes them: 27,217 cruise-only visitors, 85,195 landed visits and 1,106 deep field visitors, together with the note that IAATO has monitored and reported Antarctic tourism trends since 1991
30. National Snow and Ice Data Center — Sea Ice Today, analyses. That Antarctic sea ice reached its annual maximum extent of 17.81 million square kilometres on 17 September 2025, the third lowest in the 47-year satellite record, above only 2023 and 2024
31. GeoNames gazetteer — Ushuaia, Tierra del Fuego, Argentina. Ushuaia, seat of a first-order administrative division, at S 54°48′39″, W 68°18′57″, population 56,825 — the departure port for the great majority of Drake Passage crossings
32. GeoNames gazetteer — Cape Horn (Cabo de Hornos), Magallanes, Chile. Cape Horn, feature type cape, at S 55°58′48″, W 67°17′21″ — the last land before roughly four degrees of open water and the 60°S line
33. GeoNames gazetteer — Elephant Island, Antarctica. Elephant Island at S 61°5′5″, W 55°11′3″, elevation 852 m — the first land south of the declared northern limit of the Southern Ocean on the eastern approach
34. GeoNames gazetteer — King George Island, South Shetland Islands. King George Island at S 62°0′0″, W 58°6′0″, elevation 655 m — the South Shetland island whose airstrip carries the fly-cruise traffic that skips the Drake Passage entirely
35. GeoNames gazetteer — Deception Island, Antarctica. Deception Island at S 62°57′0″, W 60°37′58″ — the flooded volcanic caldera a vessel can sail into, roughly three degrees of latitude south of the declared limit of the Southern Ocean, and among the most heavily visited landing sites in the Peninsula region
36. GeoNames gazetteer — Grytviken, South Georgia and the South Sandwich Islands. Grytviken at S 54°16′52″, W 36°30′33″ — six degrees of latitude north of the IHO's Southern Ocean, and for most of the year south of the Antarctic Polar Front: the clearest single illustration that the declared limit and the physical boundary are different things
37. GeoNames gazetteer — Punta Arenas, Magallanes, Chile. Punta Arenas, seat of a first-order administrative division, at S 53°9′46″, W 70°54′33″, population 117,430 — the secondary gateway port and the base for most fly-cruise departures
38. International Hydrographic Organization — M-10, The IHO and its Secretariat: a History, 3rd Edition, 2019. The organisation's own institutional history, recording that the limits of oceans and seas were an agenda item at the Third International Hydrographic Conference of 1932 and again at the Fourth in 1937 and the Fifth in 1947 — the conferences that produced and then unpicked the 1937 edition
39. International Hydrographic Organization — Periodic publications (P-6 Proceedings of the 3rd Session of the IHO Assembly, 2023; P-7 Annual Report). The catalogue entry locating the two-volume proceedings of the Third Assembly and the annual reports; volume 1's contents list places PRO 3.3, 'Recognition of Southern Ocean', at page 289

Official and scientific bodies are the authority for safety, regulatory and scientific claims. Commercial operators are used only for practical detail such as tour length, meeting points and indicative pricing — never for a safety or scientific statement.