This hidden treasure, i.e. a
mountain lake known as the Emerald Lake and nicknamed the Blue Lagoon, is
located on the 240 meter high pinnacle of Koh Mae Koh, an island that is
Moo Koh Angthong, a National Marine Park
In Thai, it is known as Thale Nai, i.e. ‘Inner Sea’ or the ‘Sea Within’.