Koh Tao, or Turtle Island, got its name from its turtle-shaped outline and was historically a fishing hub, especially for sea turtles. It became popular in the 1980s after divers discovered its vibrant underwater life, making it a renowned diving destination. Today, Koh Tao remains a peaceful island known for its diving courses and beautiful beaches.

Koh Nang Yuan, a small island off Koh Tao, is famous for its sandbar connecting three hills. It was once uninhabited and used by fishermen before attracting travelers in the 1970s. The island is now known for its crystal-clear waters, excellent snorkeling, and a resort, maintaining its charm as a quiet getaway.