Diamond Cave (Prakay Phet Cave) at Chiew Lan Lake, Khao Sok National Park
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Nestled beneath towering limestone cliffs along the emerald waters of Chiew Lan Lake, Diamond Cave — locally known as Prakay Phet Cave — is one of the most impressive natural highlights inside Khao Sok National Park. From above, the dramatic karst walls rise vertically from the lake, while longtail boats gather at the cave entrance, ready to bring visitors into the hidden limestone world carved by time.
Diamond Cave Khao Sok is easily recognized by its massive cliff face and lush rainforest that clings to the rock formations. The cave itself extends deep into the mountain, featuring striking stalactites and stalagmites illuminated by natural and installed lighting that enhances the textures of the limestone. As part of a guided Khao Sok cave tour, visitors walk along wooden pathways inside the cavern, discovering geological formations that have developed over thousands of years.
Access to Prakay Phet Cave begins with a scenic boat ride across Cheow Lan Lake, making it a popular stop during a Khao Sok boat tour or as part of a Khao Sok 2 days 1 night itinerary. The contrast between the vibrant turquoise lake and the towering white limestone cliffs creates one of the most photogenic scenes within Khao Sok National Park.
Formed after the creation of Ratchaprapha Dam, Chiew Lan Lake transformed this region into a landscape of flooded valleys and hidden cave systems. Diamond Cave stands as a testament to the park’s diverse natural attractions — from freshwater lake exploration to underground limestone chambers.
For travelers seeking a deeper exploration of Khao Sok National Park, adding Diamond Cave Khao Sok to the itinerary offers a perfect blend of adventure, scenery, and geological wonder. Surrounded by rainforest and dramatic karst mountains, Prakay Phet Cave remains one of the most accessible and fascinating cave experiences near Chiew Lan Lake.