KHAO YAI NATIONAL PARK THAILAND BANGKOK Khao Yai National Park is a Thai national park. It was one of the first national parks of the state, inaugurated on 18 September 1962. The main founder was Boonsong Lekakul, one of the 20 most famous conservationists in Thailand. In 1984 the park was included among the parks protected by ASEAN, while on July 14, 2005, together with other parks located in the Dong Phayayen mountains, it was included by UNESCO as a World Heritage Site The park stretches on the slopes of a series of mountains that rise from about 800 meters of Mount Khao Kaew to about 1 350 meters of Mount Khao Rom, the highest of the area, and that are located in part in the province of Nakhon Ratchasima (Khorat) in Isan, and partly in the provinces of Saraburi, Prachinburi and Nakhon Nayok. It is the third largest park in Thailand, covering an area of 2165 square kilometers. Its altitude varies from 400 to 1000 m s.l.m. There are several waterfalls, including that of Heo Narok 80 meters high. The areas adjacent to the park have undergone rapid development with the construction of luxury hotels and golf courses. Some of these complexes limit the movement of animal migration, and reduce the possibility of future enlargement of the park.