On the 7th December B.E. 2531 (1988), the Minister of Agriculture and cooperative and parties have surveyed the condition of conservation, forest Klong Wang Chao, Klong Suan Mak forests. They found the fertile and densely teak forest and others features. They would like to conserve the forest, thus, Klong Wang Chao National Park was gazetted on the 29th Augus B.E. 2533, (1990) with 747 km2.
Most of the area consists of complicated mountains lying along the north and south. They are one part of Thong Jai Road moutain range and there is a plain area in their middle part which looks like two pan basins covering 2000 - 5000 rais. The important mountain ranges are Yen mountain, Tao Dam mountain, Tad Roop Kai mountain, Mee mountain, Doi Bang Sung, Bang Cha Le mountain, etc. Yen mountain located in the western park is the highest peak with tall about 1,898 meters above the average sea level while the height of this area is about 300 - 2,000 meters above sea level.
There are 3 seasons here which are influenced by the south-western monsoon wind.
Summer : during February - May
Raining : during June - November
Winter : during December - January
The park comprises of mixed deciduous, hill evergreen, dry evergreen, dipterocarp and pine forests. Tectona grandis, Lagerstoemia tomentosa, Afzelia xylocarpa, Pterocarpus macrocarpus and Pinus merkusii are example of important trees.
Wildlife are found here, for example, screw, elephant, screw, elphant, samber deer, bear many species of birds.