Sibu is an inland town, and the capital of Sibu District (229.8 square kilometres) in Sibu Division, Sarawak, east Malaysia. It is located at the confluence of the Rajang and Igan Rivers, some 60 kilometres from the ocean and approximately 183.3 kilometres (114 mi) east-north-east of the state capital Kuching. The population is dominated by Chinese especially the Fuzhou as well as indigenous Melanau, Malay, and Iban. The town population (year 2010) is 257,800.
Sibu is the main tourist gateway to the Upper Rajang River, with its small riverine towns and its many Iban and Orang Ulu longhouses.
There is no known adjective for the people from Sibu, although there have been many unofficial suggestions: Siburian, Sibuian, Sibunite, Sibu-yan - none is officially recognised.
There has been a marked increase in public buildings in recent years. Sibu now boasts the largest town square in Malaysia, and the tallest building in Sarawak - the Sanyan Tower，"Wisma Sanyan" in the official Malay language), a newly refurbished waterfront and a large number of public parks. Sibu also has university-level courses offered by Laila Taib College (previously known as United College Sarawak), which has built a campus on the site of the old Sibu airport.In 2010,Sarawak Government had announced that Sibu will have its own Sarawak Islamic Complex Building,the second in the state after Kuching.
Sibu Jaya, located 25 km away, is being developed as a satellite town. Sibu Airport, built during World War II, was relocated to its present site 23 kilometres from town near Sibu Jaya in 1994