The average depth of the Atlantic, with its adjacent seas, is 3,339 metres (11,000 ft); without them it is 3,926 metres (13,000 ft). The greatest depth, Milwaukee Deep with 8,380 metres (27,000 ft), is in the Puerto Rico Trench. The Atlantic's width varies from 2,848 kilometres (1,800 mi) between Brazil and Sierra Leone to over 6,400 km (4,000 mi) in the south., April 2011