Hin Daeng and Hin Muang mean Red Rock and Purple Rock. After the famous Similans and Koh Tao, these two deep water rock formations south of Koh Lanta boast some of the best diving in Thailand. Divers can see leopard sharks, blacktip reef sharks, barracudas, batfish and healthy colorful coral reefs, occasionally whale sharks and manta rays. These are deep dive sites dropping down to the depth of 25 to 70 m, often with strong currents, therefore appropriate for advanced and experienced divers. Due to their remoteness it is best to access Hin Daeng and Hin Muang by liveaboard. There are a few operators who run shorter 4D/3N liveaboards to these dive sites, including MV Giamani and MV Scuba Adventure. Some Koh Lanta dive operators, such as Kontiki Koh Lanta, offer three-tank day trips to Hin Daeng and Hin Muang. Due to the weather conditions, these dive sites are reachable only during the high season from November to April. A high possibility of the manta ray sightings is between January-March.