Dja Faunal Reserve, located in Cameroon, is a UNESCOWorld Heritage Site inscribed in 1987. Causes of inscription include diversity of species present in the park, the presence of five threatened species, and lack of disturbance within the park. The boundary that secludes the reserve is the Dja River, which almost completely surrounds it. There are more than 1,500 known plant species in the reserve, over 107 mammals more than 320 bird species in the park. The Dja Faunal Reserve covers 5,260 square kilometres (2,030 sq mi).