It has been announced as the 46th National Park of the country since 1983 covering the area of approximately 315 km2 with water area of 259 km2 . It consists of some shore area of 60 km2 and 2 islands, i.e. Kum Yai Island and Kum Nui Island including some other 8 islands, i.e. moo island, pieak num noi island, pieak num yai island, tao island, kang kao island, larn island, kum nui island and kai island. Kum yai island is 296 meters highest from the sea level, and the inlands shore area has the highest peak of the hills at aung bay is 246 meters from the sea level.
Topography
The landscape is rocky of kang krajarn in the tanaosri rocky group. The shore area of the national park is notched and deep sea, not very far from the shore it is just like a sinking area, thus all along the sea sides are quite narrow with quite a number of small short streams from the upper inland flow out to the Andaman sea. These rivers and canals have cumulated some dirts at the estuary and sea shores, thus the areas along the sea shores nearby the estuary area and the canals are covered up with mangrove forest. Areas next to the opened sea, the shores are quite muddy and sometimes dunes might be found during low tide.
Climate
The weather conditions are hot and humid, high humidity. There are 2 seasons, rainy and summer, it making the climate cool all year round. Ranong is the famous of rainy, and also called is 8 months rainy and 4 months summer district , the rainfall is more than 4,000 millimeters. Rainy is started from April to November, and June to September is the famous of rainy, so the rain fall is more than 700 millimeters per month. The summer is from December to mid April is the most appropriate season for travel
Flora and Fauna
Dry virgin forests are found in the inland, the important plants are stephania rotunda, garcinia dulcis, baccaurea sapida, etc. In the shore area found shore trees condition right here is tall forest. Shore forest is a kind of pine sea forest, located in the seashore area are mud soil and seawater to be flooded of area, it is plant social of mangrove forest. And these the geological land with quite hard of social plants, which make the area of national park are appropriated to be living place of various species of wild animals are mammals, reptiles and amphibians. Located island area and seashore area of national park cosists coral reefs and mangrove forests, as the living place of place
