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What are the Sigsbee Knolls?

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Map of the Gulf of Mexico showing surrounding regions of the United States, Mexico, Cuba, and the Yucatan Peninsula. The map highlights underwater features such as shelves, escarpments, canyons, and the Mexico Basin, with varying shades of blue indicating water depths. Major coastal cities like Houston, New Orleans, Tampa, and Havana are labeled, and spot depths are marked in meters.
Gulf of Mexico / Gulf of America

The Sigsbee Knolls are a series of hills located on the floor of the Mexico Basin, which covers a large portion of the Gulf of Mexico.12

These knolls rise above the otherwise flat abyssal plain, with some reaching heights of approximately 1,300 feet (400 meters). Geologically, they are considered surface expressions or reflections of underlying salt domes that have pushed upward through the seafloor sediments.21