Cilegon is a major coastal industrial city in Banten province, Indonesia, covering 175.51 km2. It is located on the island of Java. The city has a Census population of 374,464 in 2010; the official intercensal estimated population was 416,464 for 2014. Among the factories located in Cilegon are Krakatau Steel Company, a vital company in Indonesia, which produces steel for industrial needs, and Asahimas Chemical Company. The other name for Cilegon is "Steel City" since the city is the largest steel producer in Southeast Asia, about 6 million tons of steel produced each year in the Industrial Area Krakatau Steel, Cilegon. Additionally Cilegon is one of the vital state objects. This is because in this town there is a wide range of other vital objects such as the Merak Harbour, Krakatau Steel Industrial Zone, PLTU Suralaya, Power plant Krakatau, Krakatau Tirta Industrial Water Treatment Plant, The Sunda Strait Bridge Construction & Sunda Strait Industrial Zones.