Pufferfish contain tetrodotoxin, a substance that makes them foul tasting and often lethal to fish. To humans, tetrodotoxin is deadly, up to 1,200 times more poisonous than cyanide. There is enough toxin in one pufferfish to kill 30 adult humans, and there is no known antidote.
Dive Sites of The Similan Islands National Park
Boulder City
- Site Layout:
- Large granite boulders
- Diving depth:
- 12m to 30m+
- Currents:
- Can be strong
- Visibility:
- Up to 40m
- Surface:
- Open water, can be choppy at times
- Site access:
- Site buoyed, big boat or dinghy
This is a dive for those who like dramatic topography and great visibility! As the name suggests, 3 large clusters of boulders form the heart of the site and they are interspersed with hard corals and sand and reached by permanent buoys. The minimum depth of these clusters is between 12m and 18m. Leopard Shark can be seen here as can Great and Chevron Barracuda. Also large Surgeon Fish, Unicorn Fish, Parrotfish and Cube Box Fish can be seen feasting on the hard corals and algae that clinging to the rocks. Currents can be strong here and so, due to the minimum depth, the site is often only dived when conditions are quite gentle. Due to its position at the very south of the Similan chain 'Boulder' is often the last dive before heading home.
Select other Similan Dive Sites you can see on your liveaboard trip.
- Shark Fin Reef
- Hideaway
- Anita's Reef
- East of Eden
- Squeaky Rock
- Deep Six
- Elephant Head Rock
- Beacon Reef
- Three Trees
- North Point
- Christmas Point
For more information on the Similan Islands, visit the Similan National Park Official Site.
To see more dive sites in Thailand, choose another area:
Thailand liveaboard - Northern Phuket dive sites
Ko Bon -
Surin Islands - Ko Tachai - Richelieu Rock
Thailand liveaboard - Southern Phuket dive sites
Phi Phi Islands - Ko Haa - Hin Daeng and Hin Muang
Return to Liveaboard Dive Sites in Similan.