Attractions

Thale Nai

Thale Nai, also known as Emerald Lake, is a saltwater lagoon on Ko Mae Ko island within Mu Ko Ang Thong National Marine Park in Surat Thani Province. Enclosed by limestone cliffs and connected to the sea through an underground tunnel, the emerald-green lake is the park's most famous natural landmark. It is accessed via a short stair climb to a viewpoint and is visited as part of organized boat tours from Ko Samui.