Johor Bahru, colloquially referred to as JB, is the capital city of the Malaysian state of Johor. It is the core city of Johor Bahru District, Malaysia's second-largest district by population. As the second-largest national GDP-contributor among the major cities in Malaysia, it forms a part of Iskandar Malaysia, the nation's largest special economic zone, by investment value. The city has a population of 858,118 people within an area of 391.25 km2.