- Location: Two large outcrops directly South of Phi Phi Ley
- Site Depth: 0 - 30 meters
- Site Visability: 10 - 25 meters
- Currents: Mild / Moderate
- Difficulty Rating: Easy
Koh Bida Nok - is the outer of the two islands. On the east side of the island you will find a steep reef of large boulders covered with soft coral. In the north eastern side a sheer wall can be found dropping down to 30 meters.
The west side is completely different and you will find small boulders covered with hard corals and gorgonian fans. Around these boulders you will find a shallow sandy bottom with an average depth of 16 meters. This area is very good for finding leopard sharks, and the odd Black tip. But also this dive site is excellent for pipefish, nudibranchs and seahorses.