Pakistan, officially the Islamic Republic of Pakistan, is a country in South Asia. It is the world's fifth-most populous country with a population exceeding 225.2 million, and has the world's second-largest Muslim population. Pakistan is the 33rd-largest country by area, spanning 881,913 square kilometres. It has a 1,046-kilometre coastline along the Arabian Sea and Gulf of Oman in the south, being bordered by India to the east, Afghanistan to the west, Iran to the southwest, and China to the northeast. It is separated narrowly from Tajikistan by Afghanistan's Wakhan Corridor in the northwest, and also shares a maritime border with Oman.
Pakistan is the site of several ancient cultures, most notably the 8,500-year-old Neolithic site of Mehrgarh, the oldest in South Asia, and the Bronze Age Indus Valley Civilisation, the most extensive of the civilisations of the Old World.