Has an area of about 2,168 square kilometers in the Phanom Dong Rak mountain range. It covers 4 provinces: Nakhon Ratchasima, Nakhon Nayok, Saraburi and Prachin Buri. In the past when there were no roads through the area, Khao Yai was regarded among travelers as a wild and dangerous place. The jungle here divides the Central Region and the Northeast. Khao Yai became Thailand’s first national park on IX”1 September 1962 and is an ASEAN World Heritage because of its variety of flora and fauna.