Kuala Lumpur, officially the Federal Territory of Kuala Lumpur and commonly known as KL, is the national capital and largest city in Malaysia. As the global city of Malaysia, it covers an area of 243 km2 (94 sq mi) and has an estimated population of 1.73 million as of 2016. Greater Kuala Lumpur, also known as the Klang Valley, is an urban agglomeration of 7.25 million people as of 2017. It is among the fastest growing metropolitan regions in Southeast Asia, in both population and economic development.