Pakistan, officially the Islamic Republic of Pakistan, is a sovereign country in South Asia. With a population exceeding 180 million people, it is the sixth most populous country and with an area covering 796,095 km2 (307,374 sq mi), it is the 36th largest country in the world in terms of area. Pakistan has a 1,046-kilometre (650 mi) coastline along the Arabian Sea and the Gulf of Oman in the south. It is a federal parliamentary republic consisting of four provinces and four federal territories. It is an ethnically and linguistically diverse country, with a similar variation in its geography and wildlife. It has a semi-industrialised economy with a well-integrated agriculture sector, its economy is the 26th largest in the world in terms of purchasing power and 45th largest in terms of nominal GDP and is also characterized among the emerging and growth-leading economies of the world.