the major chokepoint is the Drake Passage between South America and Antarctica; the Polar Front (Antarctic Convergence) is the best natural definition of the northern extent of the Southern Ocean; it is a distinct region at the middle of the Antarctic Circumpolar Current that separates the cold polar surface waters to the south from the warmer waters to the north; the Front and the Current extend entirely around Antarctica, reaching south of 60 degrees south near New Zealand and near 48 degrees south in the far South Atlantic coinciding with the path of the maximum westerly winds
Economy ::Southern Ocean
Economy - overview:
Fisheries in 2006-07 landed 126,976 metric tons, of which 82% (104,586 tons) was krill (Euphausia superba) and 9.5% (12,027 tons) Patagonian toothfish (Dissostichus eleginoides - also known as Chilean sea bass), compared to 127,910 tons in 2005-06 of which 83% (106,591 tons) was krill and 9.7% (12,396 tons) Patagonian toothfish (estimated fishing from the area covered by the Convention of the Conservation of Antarctic Marine Living Resources (CCAMLR), which extends slightly beyond the Southern Ocean area). International agreements were adopted in late 1999 to reduce illegal, unreported, and unregulated fishing, which in the 2000-01 season landed, by one estimate, 8,376 metric tons of Patagonian and Antarctic toothfish. In the 2007-08 Antarctic summer, 45,213 tourists visited the Southern Ocean, compared to 35,552 in 2006-2007, and 29,799 in 2005-2006 (estimates provided to the Antarctic Treaty by the International Association of Antarctica Tour Operators (IAATO), and does not include passengers on overflights and those flying directly in and out of Antarctica).
Transportation ::Southern Ocean
Ports and terminals:
McMurdo, Palmer, and offshore anchorages in Antarctica
note: few ports or harbors exist on the southern side of the Southern Ocean; ice conditions limit use of most to short periods in midsummer; even then some cannot be entered without icebreaker escort; most Antarctic ports are operated by government research stations and, except in an emergency, are not open to commercial or private vessels
Transportation - note:
Drake Passage offers alternative to transit through the Panama Canal