The Bartlett Trough is one of the major structural and physiographic features of the Caribbean region. It extends in a flat arc, convex toward the north,from the Gulf of Honduras eastward as far as Gonaive Gulf between the two western peninsulas of Haiti, a distance of over 1,000 miles. The width, between Cuba and Jamaica, is nearly 100 miles, and the deepest sounding, according to recent reports, is about 4,000 fathoms, or 31,000 feet below the higher peaks of the Sierra Maestra in Cuba and the Blue Mountains in Jamaica.