Shark Fin Reef / Boulder City
Due to their close proximity these two sites are usually tackled together - they are anyway part of the same ridge which juts out into the sea from Similan Island 3. The seabed at this site is smothered with coral. Large boulders sit on the seabed and gaps between the boulders are also covered in coral. The marine life in the area is splendid with parrotfish in abundance and the occasional spotting of leopard sharks. The site goes down to a depth of 55 metres and is probably best left to divers with a bit of experience.