In the past, fertile fan palm forests were grown up scartteringly in the norteastern region. When the agricultural area expanded, a large number of palm forests were trespassed and destroyed. At present there are only last fan palm forests in front of Ban Thab Lan, Ban Khun Sri Bupram and Ban Wang Mued, Prachinburi Province. Thab Lan National Park covers Amphur Pak Thongchai, Khornburi and Soeng Sang of Nakorn Rachasima Province, and Amphur Na Dee of Prachinburi Province. The forests are fertile and consist of the rare fan palm forests found only in such territory. It is the source of many streams and has natural uniqueness such as the cliffs and waterfalls. Thab Lan National Park is the second biggest part of the country with its area 1,400,000 rai. It was declared a national park on 23 December 1981 to be the 40th national park of Thailand.

Topography
The landscape is of big and small mountains lining in a large area. The highest peak is Khao Lamang with its height of 992 meters from the sea level. The continuous mountain ranges have naturally created valleys, chasms and waterfalls, which are the sources of rivers, such as Moon River and Bang Pakong River.

Climate
The weather in Huai Thaub Lan consists of three seasons.
The summer is from February to May.
The rainy season is from March to November.
The winter is from December to January.

Flora and Fauna
The park is covered with dipterocarp and dry evergreen forest, which are full of various kinds of plants. Because of its richness of big forestry area connecting to Khao Yai, Pang Sida and Tapraya, it is the living place for various wild animals e.g. tiger, elephant, buffalo, red bull, mountain goat, black bear, sun bear, crown gibbon, hornbills, pheasant, lorikeet, etc.