Afghanistan officially the Islamic Republic of Afghanistan, is a landlocked country located within south-central Asia. Afghanistan is bordered by Pakistan in the south and east Iran in the west; Turkmenistan, Uzbekistan, and Tajikistan in the north; and in the far northeast, China. Its territory covers 652,000 square kilometers (252,000 sq mi) and much of it is covered by the Hindu Kush mountain range, which experience very cold winters. The north consists of fertile plains, whilst the south-west consists of deserts where temperatures can get very hot in summers. Kabul serves as the capital and its largest city. The political history of the modern state of Afghanistan began with the Hotak and Durrani dynasties in the 18th century. In the late 19th century, Afghanistan became a buffer state in the “Great Game” between British India and the Russian Empire. Its border with British India, the Durand Line, was formed in 1893 but it is not recognized by the Afghan government and it has led to strained relations with Pakistan since the latter’s independence in 1947.