Than Sadet-Ko Pha-Ngan
() is a national park in southern Thailand
, protecting 65.93 km² mostly on the island Pha Ngan
. The park was established on December 31 1983 covering an area of 39.12 km², and enlarged to its present size on February 10 1999.
The park is named after the river Than Sadet (lit. Royal River
). The river forms the largest waterfall on the island, which was visited by several Thai kings, for example Rama V
, who visited 14 times. Not far from the waterfall the river empties into the sea at Than Sadet Bay.
Khao Ra is both the highest elevation of the park as well as of the whole island Pha Ngan, peaking at 727 above sealevel.
In addition to the forest on Pha Ngan itself, the park also includes several small islands north of Pha Ngan, including Wao and Hin Bai archipelago.