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Journey time: 35minutes, distance 30km

Suitable: All levels diving & snorkeling

Maximum depth: 30m allowed for recreational divers 

Koh Bida Nok and Koh Bida Nai are two of the most popular dive sites near the Phi Phi Islands. Also called as ‘The Bidas’, these limestone pinnacles are famous for their spectacular underwater topography with swim-throughs, walls and underwater caves. The rocky islands are especially known for reef sharks and leopard sharks often spotted around the areas. Both of the dive sites are suitable for all levels of diving and snorkeling. 

Koh Bida Nok is the biggest of the two islands. The south side of the island opens as a small bay that works as an ideal environment for the beginner divers to practise their skills. The bay is also perfect spot for snorkeling with its sheltered shallow waters. Black tip reef sharks can sometimes be seen swimming around the edges of the bay and it is also home for many different colourful sea creatures, such as crown sea stars, parrot fish and butterfly fish. 

Going to the west from the bay, divers can follow down a stunning finger reef. Octopuses and turtles can be seen swimming around here as well as sting rays resting in the sandy ocean floor. If you are looking for a small buoyancy challenge, there is a vertical swim through in the southwest of the island. The north side of Koh Bida Nok offers another kind of challenge with a narrow underwater cave but can only be accessed by certified Cavern divers. Additionally, the north presents beautiful wall dives, while the east side of the island gives great conditions to spot black tip reef sharks with its shallow reefs sometimes only 3 meters deep. 

Similarly to its larger sister island, Koh Bida Nai presents some swim throughs and canyons to explore as well as steep walls full of unique makro life. Covered with soft corals, the west side of the island offers a beautiful wall dive. This wall is a home for many different nudibranchs and shrimps, such as mantis peacock shrimp.


Fantasy reef, located in the south-east side of Koh Bida Nai, offers a playground for the more experienced divers with steeper walls, underwater cracks and canyons. Following the island to the east, the reef gets more shallow. In these shallow waters the luckiest divers might spot leopard sharks swimming around in the sandy bottom. 

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