side, fifteen miles long, runs irregularly S.S.W. from Grande Vigue to our starting point - Pointe à Pitre, with a popula- tion of about 20000 people, lies at the northern end of the southern one third of the western side. The surface of this portion of the double island of Guadeloupe is undulating, but no hill rises more than 200 feet above the sea. The southwestern part of the triangle might even be described as hilly, while the northern angle shows a fault scarp bluff 80 to 100 feet high trending southward for about 6 miles from Grande Vigue toward the middle of the island. No per- manent stream of water is