Khao Yai National Park is Thailand’s second largest, covering 2,168 sq km, encompassing 11 districts and 4 provinces; Sara Buri, Nakhon Ratchasima, Prachin Buri, and Nakhon Nayok. Khao Yai National Park has within its boundaries many thick, flourishing forests, and a plentiful supply of wildlife, such as families of elephants, tigers, gibbons, deer, and wild pigs, etc. This park is the source of five important waterways: the Nakhon Nayok, Prachin Buri , Lamtacong , Lamtaplung, and Hui Muak Lek Rivers. Lands adjacent to the national park are increasingly developed into luxury hotels and golf courses for weekend visitors from Bangkok. Such development limits wildlife corridors and permanently reduces future conservation and land acquisition ability.

Khao Yai National Park was Thailand’s first National Park, and was established on September 18, 1962. It was originally known as 'The National Park Heritage of Asian Group Countries'. In 1984 the park was made an ASEAN Heritage Site, and on July 14 2005 the park was inscribed as a UNESCO World Heritage site under the name Dong Phaya Yen–Khao Yai Forest Complex together with other parks in the Dong Phaya Yen mountains.

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