Trang is a province in southern Thailand on the coast of the Andaman Sea. The mainland coast is a stretch of rugged limestone cliffs, mangrove-lined beaches and remote caves. Its offshore islands include the beach resort Ko Kradan and Ko Muk, known for its Morakot (Emerald) Cave, a water-filled cavern accessible only at low tide. The capital, also called Trang, is a traditional town and transit hub.