Miri is the main tourist gateway to the world-famous UNESCO World Heritage Site, Gunung Mulu National Park; Loagan Bunut National Park; Lambir Hills National Park; Niah National Park and Miri-Sibuti Coral Reef National Park. The Gunung Mulu National Park with its Sarawak Chamber, which is the largest known cave chamber in the world by area, remains one of the favourite ecotourism destinations in Miri. Miri is also the birthplace of the Malaysian petroleum industry. Other major industries in the city include timber, oil palm and tourism .