Found in the Southern part of Thailand, Koh Ngai, often spelled Koh Hai, is a three hour journey from the main beach, Koh Lanta Yai. For this reason, it is often completed as part of a liveaboard trip. It can be also completed by taking a boat from the nearby beach but this can take up to three hours.

The dive is relatively shallow from around 8 meters to the deepest spot of 16 meters. The dive site is an easy spot to dive with mild currents most of the time and so it is well suited to beginner divers. All level of divers will enjoy the dive, which can be accessed all year round. The water temperature rarely falls below 25 degrees making it a lovely warm dive spot.

The site is well known as a place to see Nurse Sharks and Leopard Sharks, the former being rare in other dive sites in the region. Other sharks that divers can spot are reef sharks including both the black tip reef shark and the white tip reef shark. There are many of the usual reef fish of the region in abundance as well and so the journey to this dive site is well worth the effort.