The Drake Passage Adventure Tours
The 800-kilometer (500 mi) wide passage between Cape Horn and Livingston Island is the shortest crossing from Antarctica to any other landmass. The boundary between the Atlantic and Pacific Oceans is sometimes taken to be a line drawn from Cape Horn to Snow Island (130 kilometers (81 mi) north of mainland Antarctica). Alternatively, the meridian that passes through Cape Horn may be taken as the boundary. Both boundaries lie entirely within the Drake Passage.
The other two passages around the extreme southern part of South America (though not going around Cape Horn as such), Magellan Strait and Beagle Channel, are very narrow, leaving little room for a ship. They can also become icebound, and sometimes the wind blows so strongly no sailing vessel can make headway against it. Hence most sailing ships preferred the Drake Passage, which is open water for hundreds of miles, despite very rough conditions. The small Diego Ramírez Islands lie about 100 kilometers (62 mi) south-southwest of Cape Horn.
There is no significant land anywhere around the world at the latitudes of the Drake Passage, which is important to the unimpeded flow of the Antarctic Circumpolar Current which carries a huge volume of water (about 600 times the flow of the Amazon River) through the Passage and around Antarctica. Ships in the Passage are often good platforms for the sighting of whales, dolphins, and seabirds including giant petrels, other petrels, albatrosses, and penguins. The passage is known to have been closed until around 41 million years ago according to a chemical study of fish teeth found in oceanic sedimentary rock. Before the passage opened, the Atlantic and Pacific Oceans were separated entirely with Antarctica being much warmer and having no ice cap. The joining of the two great oceans started the Antarctic Circumpolar Current and cooled the continent significantly.