Parts of today's national park and World Heritage site have been protected since the early 20th century. Krakatoa (or rather, the three islets which remain of it) was declared as a Nature Reserve in 1921, followed by Pulau Panaitan and Pulau Peucang Nature Reserve in 1937, the Ujung Kulon Nature Reserve in 1958, the Gunung Honje Nature Reserve in 1967, and most recently Ujung Kulon National Park in 1992. In 2005 the park was designated as an ASEAN Heritage Park.