Bida Nai - Phi Phi Islands

Bida Nai

Highly recommended



Plan your dive



At a glance:


  • Max depth: 30 meters

  • Level of difficulty: Open water upwards.

  • Visibility: 15 Meters

  • Current: none too strong

  • Recommended Season: All year round is possible

  • Quick Tip: Watch out for Black Tip Reef Sharks


Great wall diving with many boulders to explore and swim-throughs to test your buoyancy.



Heading south from Phi Phi main Islands Bida Nai is the second most southerly island of the archipelago and lies only a couple of hundred metres from its sister island Bida Nok.

Choosing your favourite of these two dive sites is similar to choosing your favourite child, it really goes down on a day by day basis which is best on the day.


All the dive sites around Phi Phi are ideal for all PADI Dive Courses:

Discover Scuba Diver 
Open Water Diver
Advanced Diver
Rescue Diver


Fantasy Reef sits about eighty metres out from the main small bay of the island and comprises of several underwater pinnacles the deepest is about twenty-seven metres.


These two dive sites are very popular with day trip boats operating out of Phi Phi Island and also you may spot a Liveaboard or two here particularly in the early morning or mid-afternoon on their way to Phuket and the Similans or down to Koh Haa and Hin Muang.

As you start your dive in the bay heading south you will undoubtedly come across Giant Moray Eels, Lion Fish and a swarm of Wrasses and Parrotfish maybe even some Blue spotted Stingrays taking it easy in the sand.

On Fantasy there among the large boulders you can find swim-throughs making it a really exciting part of the dive. You will find several large Gorgonian Sea Fans and Whip Corals, which are great for macro life.


Other PP Sites:

Bida Nok 
Coral Garden (Aka Palong)
HTMS Kletkaew
Phi Phi Shark Point


When swimming around Fantasy Reef take a look up and you will see predators hunting; there are Trevallies, Tuna and if you are lucky the Chevron Barracudas will be there circling, it’s a wonderful sight.

You can also find Black Tip Reef Sharks here though they are usually quite close to the shoreline in the shallows.

Some time ago I was leading a group of divers around to the north of the site and out on the sand was this rather large mass, as the visibility was not fantastic that day, we had to get quite close to see what it was.​

Barrel Sponge -  Liveaboards Phuket

As we approached, the current pushing us ever closer to the blurred object, eventually we could see that it was two Leopard sharks and they were mating. 

The male shark had flipped the female over onto her back; this induces a kind of paralysis, there was some biting of fins and as we were being drawn in closer by the current I decided it best to leave these two lovebirds in peace before they became a little upset with the nosey divers.


There is a spectacular wall on the north of the island in this area you will find even more hunting fish with the Trevallies, Emperors, Tunas and Mackerels launching sorties into the baitfish balls.


You will spot many Barrel sponges on Bida Nai and Bida Nok these are actually classed as animals and these creatures can filter hundreds of litres of water a day, which they extract for food - tiny microorganisms.

Be careful with them and its best not to touch as these can be very old indeed, with some of the sponges on record as old as two thousand years old -making them some of the oldest living things on the planet.

Fish to look out for here: Leopard sharks, Black Tips, Great Barracuda, Trevallies and other Jacks, Squid, Octopus, Cuttlefish, Tiger Tail Seahorses, Ornate Ghost Pipe Fish even Frogfish have been spotted here.

Contact Liveaboard Phuket

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