Southern Ocean Southern Ocean The Southern Ocean, also known as the Antarctic Ocean or the Austral Ocean, comprises the southernmost waters of the World Ocean, generally taken to be south of 60° S latitude and encircling Antarctica. As such, it is regarded as the fourth-largest of the five principal oceanic divisions: smaller than the Pacific, Atlantic, and Indian Oceans but larger than the Arctic Ocean. This ocean zone is where cold, northward flowing waters from the Antarctic mix with warmer subantarctic waters. By way of his voyages in the 1770s, Captain James Cook proved that waters encompassed the southern latitudes of the
Litke Deep Litke Deep Litke Deep () is an oceanic trench in the Arctic Ocean. It is the deepest known point in the Arctic Ocean. It is the 20th deepest oceanic trench in the world. The Litke Deep is located in the southwestern part of the Eurasian Basin south of the underwater ridge Gakkel Ridge roughly 350 kilometers northeast of Svalbard and roughly 220 km north of the island of Nordaustlandet. The deepest part is at 5,449 metres (17,881 feet) under sea level. The average depth in the Arctic Ocean is about 1,000 metres and more than 60 % is less than