The Inner Sea at Mae Ko Island, Ang Thong National Marine Park.

Location: The Inner Sea at Mae Ko Island, Ang Thong National Marine Park This spot is usually included in tours of Ang Thong National Marine Park. When you arrive at Mae Ko Island, you need to hike up to the viewpoint to see the Inner Sea. The water is very beautiful, and you can see coral from the viewpoint. Note: Swimming is not allowed due to safety concerns and the depth of the water. Location: Ang Thong, Ko Samui District, Surat Thani