Koh Rong

Koh Rong sits in the Gulf of Thailand, reached by boat from the mainland, and the beach it's famous for runs for kilometers without a resort strip to break it up. The sand is powdery white, the water shallow and calm enough to wade out forever, and the jungle presses in at the edges. It landed at number nine on the World's 50 Best Beaches list. The low development isn't an accident; it's the whole point.