Roatán is an island in the Caribbean, about 65 km (40 mi) off the northern coast of Honduras. It is the largest of the Bay Islands. It is approximately 77 km (48 mi) long, and less than 8 km (5 mi) wide. The island rests on an exposed ancient coral reef, offering opportunities for diving. Located near the Mesoamerican Barrier Reef, the largest barrier reef in the Caribbean Sea, Roatán has become an important tourism destination in Honduras.