<P> The Sigsbee Deep (Mexico basin in the U.S. Board on Geographic Names Advisory Committee on Undersea Features (ACUF) Gazetteer), is a roughly triangular basin that is the deepest part of the Gulf of Mexico named for Commander Charles Dwight Sigsbee, USN, Assistant U.S. Coast and Geodetic Survey, commanding officer of the USC&GS George S. Blake which discovered the feature during its mapping of the Gulf of Mexico . As described below there is some confusion of names that apply to the basin or a particular point in the basin with both being found in technical and popular literature applying to both basin and the coordinates . </P> <P> The basin is located in the southwestern quadrant of the Gulf, with its closest point to the U.S. coast at 200 miles (320 km) southeast of Brownsville, Texas . The actual maximum depth is disputed and estimates range between 3,750 and 4,384 metres (12,303 and 14,383 ft). The average depth of the Gulf is roughly 1,615 metres (5,299 ft). The Sigsbee Abyssal Plain is the deepest and flattest sector of the deep basin . </P>

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