Khao Yai National Park is located in 11 districts in 4 provinces: Pak Chong and Wang Nam Khiao, Nakhon Ratchasima Province; Na Di, Kabin Buri, Prachantakham, and Mueang Prachin Buri Districts, Prachin Buri Province; Pak Phli, Ban Na, and Mueang Nakhon Nayok Districts, Nakhon Nayok Province; and Kaeng Khoi and Muak Lek Districts, Saraburi Province. It is the first national park in Thailand, having been declared a national park on September 18, 1962, and has been nicknamed the “ASEAN Heritage Park”.

Khao Yai National Park covers an area of ​​2,215.42 square kilometers. It consists of mixed deciduous forest, dry evergreen forest, moist evergreen forest, hill evergreen forest, grassland and second generation forest. This type of rainforest is located at an altitude of 400-1,000 meters above mean sea level. There are 3,000 species of plants, more than 189 species of butterflies, more than 350 species of wild birds and 71 species of mammals, including elephants, tigers, gibbons, deer and wild boars, found in the wide grasslands throughout.