Dive sites explained – Bida Nok

Bida Nok Thailand Kon-Tiki Diving & Snorkeling Center
This dive site is one of the most popular and visited site on the west coast of Thailand. Boats travel from Phuket, Phi Phi, Ao Nang and Koh Lanta to dive here, but it is easy to escape the crowd.

Bida Nok is the outer island of the two limestone cliffs just south of Phi Phi. The south eastern bay is the usual entry for students and beginner divers, but the north western deeper part is a nice alternative for the more experienced.

Depth ranges from just a few meters in the bay to around 30 meters on the wall, which continues out even deeper. However, below 20 meters there is usually a thermocline with poor visibility and fewer amounts of corals with marine life.


  • The bay area itself usually has good visibility with lots of small schools of barracudas and snappers. Here the bottom is filled with sea urchins and pistol shrimps with their partner gobies. Out in the sand there are possibilities to find Kuhl´s stingrays. Keeping the reef on the right you head straight towards finger reef, a pristine ridge filled with critters.
  • Following the bay heading north, we pass several pinnacles where you can find scorpion fish, clown fish, morays and hunting trevallies. After 20-30 minute swim the rocks turns to an alley filled with large gorgonian fan corals bursting with life.
  • Between the bay and the area with the gorgonians the shallow area is filled with colourful corals. Here there are a few blacktip reef sharks circling the rocks in only a couple of meters depth.
  • Following the north western wall heading south is quite spectacular. Before midday this side of the island is in the shade, which combined with good visibility, a great feeling of depth. Above the rocks and pinnacles there are schools of trevallies and jacks as well as an abundance of reef life.
  • As the western side meets the finger reef, the wall here is covered by shrimps, glassfish and other schools of fish. The Occasional octopus is not uncommon and there is a chance to spot leopard sharks out in the sand.

To think about

  • Currents are not unusual for this island and will control the direction that you can dive this site, sometimes even as strong, having to turn the dives around.
  • Scorpion, lionfish and sea urchins are common so keeping buoyancy control here as with every reef is very important.
  • As this is a popular site there are many boats and divers around. Make sure to respect other groups and surface close to the reef even if you are under a surface marker.

depth:                  5 – 30 meters
current:                mild – moderate
visibility:               10 – 25 meters

You can dive Bida Nok from our dive centers in Phuket, Koh Lanta & Krabi