Koh Racha Yai and Koh Racha Noi, also known as Koh Raya Yai and Koh Raya Noi, are twin islands off the south eastern coast of Phuket. Known for their crystal clear blue waters these islands have been an almost exclusive paradise for divers for years. With Racha Yai's white sand beaches and expanding accommodations, Racha Yai is growing in popularity.