Endau-Rompin National Park is a protected tropical rainforest in the southernmost prolongation of the Tenasserim Hills, Malaysia. It is an area south of the state of Pahang and to the northeast of Johor covering an approximate area of 870 km², effectively making it the second largest national park in Peninsular Malaysia after Taman Negara, with approximately 26 km of trail. It is the second national park proclaimed by the government of Malaysia.The park is one of the oldest tropical rainforest complexes in the world and features rock formations some 248 million years old. Apart from that, the park contained the largest remaining population of the threatened Northern Sumatran rhinoceros species on the Malay Peninsula. Gunung Besar which is the second highest in Johor is located in the park.The park takes it name from the Endau and Rompin rivers that flow through the park. Other rivers that flow through the parks are Segamat, Selai and Jasin.During the monsoon season that covers from November till March, the park is closed to the public. Further, fishing is banned from September till October during mating season.HistoryThe first scientific study of the area was conducted in 1892 by H.W. Lake and Lieutenant H.J. Kelsall. With the aid of the study, the forest complex of Endau-Kluang was gazetted as a forest reserve in 1933. Later in 1972, the forest reserve was expanded to include Lesong forest reserve in Pahang.