Established in 1962 as Thailand's first national park, it is the third largest national park in Thailand. Situated mainly in Nakhon Ratchasima Province, Khao Yai extends into Prachinburi, Saraburi and Nakhon Nayok provinces. Khao Yai is just 3 hours away from Bangkok.
The park covers an area of 2,168 square kilometres, including rain/evergreen forests and grasslands. 1,351 m high Khao Rom is the highest mountain within the park. The average altitude of the national park ranges from 400 to 1000 m above the sea level.