The park is rugged mountain range parallel Andaman Sea coast. The forest on high elevation is fertile for wild life and on the hill is the headwater. Therefore, there are many beautiful waterfalls and cliffs such as Khlong Khu Rot, Khlong Tam Nang, Khlong Phraek Khwa, Khlong Phraek Sai, Khlong Nang Yon, Khlong Bang Wan and Khlong Bang Yai.
The main area is moist evergreen forest, which has Dipterocarpus spp. and Hopea odorata as dominant trees. Moreover, there are herb, bulb plants, moses, fern and other low structure plants. The wildlife, which found abundanly in the forest north of Chiao Lan Dam are Malaya tapir, serow, elephant, barking deer, beer,tiger, lesser mouse deer, gibbon, macaque, langur,banteng, wild boar and birds.