Balochistan (; Balochi: بلۏچستان; also romanised as Baluchistan and Baluchestan) is an arid desert and mountainous geographic historical region in South and Western Asia. It comprises the Pakistani province of Balochistan, the Iranian province of Sistan and Baluchestan, and the southern areas of Afghanistan, including Nimruz, Helmand and Kandahar provinces. Balochistan borders the Pashtunistan region to the north, Sindh and Punjab to the east, and Persian regions to the west. South of its southern coastline, including the Makran Coast, are the Arabian Sea and the Gulf of Oman.