Pirin National Park is a World Heritage national park that encompasses the larger part of the Pirin Mountains in the southwest of Bulgaria. It has an area of about 400 km2 (150 sq mi) and lies at an altitude from 1,008–2,914 m (3,307–9,560 ft). Two nature reserves are located within the boundaries of the park, Bayuvi Dupki-Dzhindzhiritsa, one of the oldest in the country, and Yulen.The park's boundaries and size have stood many changes through the course of history. Vihren National Park was created on 8 November 1962 with the purpose of preservation of the forests in the highest parts of the mountain. The park had an area of 62 km2 (24 sq mi), which is a small part of its modern territory. It was renamed to Pirin People's Park in 1974 with a ministerial decree and its territory was considerably enlarged. A separate park administration was established in 1979 with its seat in Bansko. The park was included in the UNESCO World Heritage List in 1983, and after a protected areas law was approved in 1998, the area was proclaimed a national park, embracing a territory of 403.32 km2 (155.72 sq mi).