Pashtunistan (پښتونستان) is a historical region located on the Iranian Plateau, inhabited by the indigenous Pashtun people of southern Afghanistan and northwestern Pakistan in South-Central Asia, wherein Pashtun culture, the Pashto language, and Pashtun identity have been based. Alternative names historically used for the region include Pashtūnkhwā (پښتونخوا), Pakhtūnistān, Pathānistān, or simply the Pashtun Belt. Pashtunistan borders the geographical regions of Turkestan to the north, Kashmir to the northeast, Punjab to the east, Balochistan to the south and Iran to the west.
During British rule in India in 1893, Mortimer Durand drew the Durand Line, fixing the limits of the spheres of influence between the Emirate of Afghanistan and British India during the Great Game and leaving about half of historical Pashtun territory under British colonial rule; after the partition of India, the Durand Line now forms the internationally recognized border between Afghanistan and Pakistan. The traditional Pashtun homeland stretches roughly from the areas south of the Amu River in Afghanistan to the areas west of the Indus River in Pakistan; it predominantly comprises the southwestern, eastern and some northern and western districts of Afghanistan, and Pakhtunkhwa and northern Balochistan in Pakistan.
The 16th-century revolutionary leader Bayazid Pir Roshan of Waziristan and the 17th-century "warrior-poet" Khushal Khan Khattak assembled Pashtun armies to fight against the Mughal Empire in the region. During this time, the eastern parts of Pashtunistan were ruled by the Mughals while the western parts were ruled by Safavid Iran. Pashtunistan first gained an autonomous status in 1709, when Mirwais Hotak successfully revolted against the Safavids in Loy Kandahar. The Pashtuns later achieved unity under the leadership of Ahmad Shah Durrani, who founded the Durrani dynasty and established the Afghan Empire in 1747. In the 19th century, however, the Afghan Empire lost large parts of its eastern territory to the Sikh Empire and later the British Empire.