Emerald Pool is located in Ang Thong Marine Park on Koh Samui, a completely undeveloped rainforest where a large number of rare flora and fauna flourish. The saltwater lake is created by the adjacent sea. Visitors must keep a distance from Emerald Lake, but are more than welcome to snorkel in the warm ocean. A hike along the park’s trails and limestone karst formations offers a stunning view of Emerald Lake, with water unbelievably pristine and turquoise. However, swimming is strictly prohibited at this lake.