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Southern Ocean
The Southern Ocean is the no. 4th contiguous open water surface on earth. It has a huge, 7,848,300 square mile (20,327,000 square km) area and 13,100-16,400 square feet (4,000-5,000 square meters) average depth. The Southern Ocean’s greatest known depth is 23,736 feet (7,235 meters), which can be found at South Sandwich Trench.