The Khao Kho mountains comprise a variety of small and large mountains in the Phetchabun range, located in Amphoe Khao Kho. Mountain Serdang trees, or “Ton Kho” in Thai, pepper the mountains, lending the mountains its name. A range of forests can be found here, including deciduous, pine and evergreen forests. The noteworthy Palmae plant, similar to the Asian Palmyra, can sometimes also be spotted here, bearing fruits in bunches like betel nuts.