This area was designated a park in 1975, becoming Thailand's 13th National Park. It covers an area of about 84 square km. Named after 2 mountains in Chantaburi and Rayong provinces. It provides an important watershed area for the agriculture of the region. Tropical broad-leaved evergreen forests dominated the lowland elevations up to 1000 m.

Animals that can probably still be found in the park include elephant, gaur, serow, bear, wild pig, deer, pileated gibbon and banded langur. There are also 53 confirmed bird species including the wreathed and great hornbills. "In the deep pools of Khao Chamao waterfall is found a species of carp (tor soro) which old timers in the area claim gave the Khao Chamao, which translates to get drunk its name. They say people who eat the fish become light headed.

Caves in The Khao Wong Area

about 18 km. From Na Yai Arm Market in Tamai. There are about 80 caves in this area of limestone mountains. Some of which are, Rakon cave, Phet cave, and Chedi cave.

Khao Chamao Khao Wong Waterfall

this waterfall is located near the park headquarters. It is a large waterfall spread with many levels along a stretch of 3kms. The water is clear, making it easy to spot all the fish in the pools. Chan Wang Machar is a particularly nice level to visit. There is a trail leading to the waterfall which passes through scenic forest and also it has rest shelters and toilets.

Klong Pla-Gang Waterfall

Klong Pla-Gang Waterfall this is the most beautiful waterfall in the park. 5km from park headquarters, passing through rich forest, many orchids, ferns and medicinal plants can also be seen along the trail to the waterfall.

Par Sawan (Sawan Cliff)

Erected over a waterfall which has clear water flowing for 900 meters, Par Sawan is on a route passing productive rain forest which consists of woods and Prong (a kind of Cycadaceae), and inhabits many kinds of wild animal. Traveler can clearly see the scenery of Khao Lam Ya and Samed Island on the sunny day.