Angammedilla National Park is one of the new national parks in Sri Lanka. The region was designated a national park on 6 June 2006. Originally Angammedilla was a forest reserve within the Minneriya-Girithale Sanctuary. The park is declared mainly to protect the drainage basin of Parakrama Samudra. Angammedilla also secures the drainage basins of Minneriya and Girithale irrigation tanks, water sources in Sudu Kanda (“White Hill”) and habitats and wildlife of the adjacent forests.

Sri Lankan elephant, Sri Lankan sambar deer, Indian muntjac, Sri Lankan axis deer, water buffalo, wild boar, and peafowl are common within the park. However, Sri Lanka leopard, sloth bear, grizzled giant squirrel, and Sri Lanka junglefowl are sometimes seen. The primate species red slender loris, tufted gray langur, and purple-faced langur are seen also.