Most of the park is covered in deep, steep forest. Over three-quarters of the area has slopes greater than 30 %, 85 % of the terrain is evergreen rainforest, another 10 % is mixed deciduous forest. The forest is rich and complex, with hanging lianas, ferns and orchids, and an abundance of fruiting trees and vines. The forest of kaeng Krachan is unusually diverse because of its location at the juncture of continental Asia and the Malaysian Peninsula. Continental species such as oaks, chestnuts, and maples are found here, as are peninsula palms and fruiting trees.