Though blackwater diving has long been popular in Hawaii, Florida, and the Philippines, blackwater diving in Thailand has begun gaining traction.

The underwater world in Thailand is rich and varied, and the scuba diving in Koh Lanta is no exception. Here are our picks for some of the best sites.

The best scuba diving in Krabi offers drop-offs, reefs, wall dives, swim-throughs, and caverns that are home to over 200 species of fish and 80 species of coral.

They’re a tropical paradise topside, but the scuba diving in the Similan Islands is the draw for thousands of visitors every year.

Koh Tao in Thailand is one of the world’s busiest dive destinations, and its popularity has had an impact. But divers have found a way to pitch in on Koh Tao marine conservation efforts.

The decreasing dugong population in southern Thailand forced the locals there to do something about it. Saving the dugongs of Si Kao has become a team effort.

Koh Ha is a tiny group of uninhabited islands, about an hour’s boat ride from Trang on Thailand’s southwest coast. And it makes for some fantastic diving.

Koh Tao is famous for raucous parties and white, sandy beaches. But the diving is pretty great too. Here are five of the top dive sites in Koh Tao.

The captive-dolphin aquarium Dolphin Bay Phuket is drawing the ire of local activists and marine-wildlife advocates