Khao Yai National Park

Khao Yai National Park is Thailand's first national park, established in 1962, covering 2,168 square kilometers across Nakhon Ratchasima, Saraburi, Prachinburi and Nakhon Nayok provinces. The Nakhon Nayok section is accessed via Pak Phli District at the Noen Hom checkpoint. Part of the Dong Phayayen-Khao Yai Forest Complex UNESCO World Heritage Site, it features evergreen forests, mountains, grasslands, waterfalls and diverse wildlife including elephants, gibbons and hornbills.

Visitors can expect a large forested mountain park with paved roads connecting viewpoints, waterfalls, grasslands and trailheads. The Pak Phli (Noen Hom) entrance leads to the central plateau with visitor centers, campgrounds, observation towers and well-marked nature trails. Common sights include Haew Narok and Haew Suwat waterfalls, Pha Diao Dai viewpoint, wildlife such as deer, macaques and birds, and opportunities for hiking, driving tours and camping in a cool, forested environment.

Established on 18 September 1962 as Thailand's first national park, following advocacy by conservationist Boonsong Lekakul. It was designated as part of the Dong Phayayen-Khao Yai Forest Complex UNESCO World Heritage Site in July 2005 for its outstanding biodiversity and importance for conservation of tropical forest ecosystems.

The park is a national symbol of nature conservation in Thailand and serves as a major center for environmental education, eco-tourism and research on tropical forest ecology.