Kuala Lumpur, officially the Federal Territory of Kuala Lumpur, or more commonly KL, is the national capital of Malaysia as well as its largest city. The only alpha world city in Malaysia, it covers an area of 243 km² 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 South-East Asia, in both population and economic development. Kuala Lumpur is the cultural, financial and economic centre of Malaysia, home to the Parliament of Malaysia, and the official residence of the Malaysian King, the Istana Negara. The city once held the headquarters of the executive and judicial branches of the federal government as well, but they were moved to Putrajaya in early 1999. Some sections of the judiciary still remain in Kuala Lumpur. Kuala Lumpur is one of three Federal Territories of Malaysia, enclaved within the state of Selangor, on the central west coast of Peninsular Malaysia.