Koh Bida Nai is the smaller of the two Bida islands, offering a unique diving experience with one of the most spectacular wall dives in the region. From the west to northeast side, you'll find a perfect wall habitat for small reef fish, nudibranchs, and shrimps. Famous for a swim-through cave crowded with thousands of tiny glassfish. Leopard sharks are commonly spotted on the eastern side, along with blacktip reef sharks and sea turtles.