submarine trench on the floor of the western Caribbean Sea between Jamaica and the Cayman Islands. It extends from the Windward Passage at the southeastern tip of Cuba toward Guatemala. The relatively narrow trough trends east-northeast to west-southwest and has a maximum depth of 25,216 feet (7,686 m), the deepest point in the Caribbean Sea. The Cayman Ridge separates the trough from the Yucatan Basin in the north, and the Jamaica Ridge, which supports the island of Jamaica, separates it from the Colombian Basin farther south. Submarine earthquakes sometimes occur around the edges of the trench.
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