The park is the third largest in Thailand. It covers an area of 300 square kilometers, including evergreen forests and grasslands. Its altitude mostly ranges from 400–1,000 m above sea level. There are 3,000 species of plants, 320 species of birds like red junglefowl and coral-billed ground cuckoo, and 66 species of mammals, including Asian black bear, Asian elephant, gaur, gibbon, Indian sambar deer, pig-tailed macaque,[disambiguation needed] Indian muntjac, dhole, and wild pig. Although evidence of tiger presence has not been recorded recently, monitoring by Freeland Foundation in collaboration with Department of National Park rangers has discovered tigers (the Indochinese tiger subspecies) in other parts of eastern Thailand where they were previously thought to have been completely extirpated.[1] Its waterfalls include the 80 metre Heo Narok, and Heo Suwat made famous from the film The Beach. Namtok Sarika is popular with the Thais.