The largest but probably the least known of the bigger islands. Laced with creeks and densely forested inland, the interior is still largely untouched and natural. Off the eastern shore is the 224km- (140 mile-) long coral barrier reef – the world’s third longest. Beyond the reef, the ocean floor drops away steeply to a depth of more than 1.5km (1 mile); called the Tongue of the Ocean, deep-water fishing is a major attraction here. Captain Bill's Blue Hole is an attraction, 180ft deep, 440ft wide in diameter. In Congo Town is the world-famous StarGate Blue Hole where Indian skulls were discovered in the early 1990s.