Metropolitan Manila (often shortened as Metro Manila; Tagalog: Kalakhang Maynila), officially the National Capital Region (NCR), is the seat of government and one of three defined metropolitan areas in the Philippines. It is composed of 16 cities: the city of Manila, Quezon City, Caloocan, Las Piñas, Makati, Malabon, Mandaluyong, Marikina, Muntinlupa, Navotas, Parañaque, Pasay, Pasig, San Juan, Taguig, and Valenzuela, as well as the municipality of Pateros. The region encompasses an area of 619.57 square kilometers (239.22 sq mi) and a population of 12,877,253 as of 2015. It is the second most populous and the most densely populated region of the Philippines. It is also the 9th most populous metropolitan area in Asia and the 5th most populous urban area in the world.