That's an hidden gem in Chanthaburi, but this Grand Canyon is more a spot for drone pilots. From the ground, you can't see much, and to be honest, I'm not sure you can really swim in there. But if you can fly, then this mountain coming from nowhere with the incredible colours of the water make a surreal landscape and great photos! It's a very good stop if you go from Bangkok to the islands Koh chang / Koh Kood.