Afghanistan, an extensive country of Asia, north-west of India. It lies between Persia and the Indies, and in the other direction between the Hindu Kush and the Indian Ocean. It formerly included the Persian provinces of Khorassan and Kohistan, together with Herat, Beluchistan, Cashmere, and Sinde, and a considerable part of the Punjab. In its present limits there are probably not more than 4,000,000 inhabitants. The surface of Afghanistan is very irregular, – lofty table lands, vast mountains, deep valleys, and ravines. Like all mountainous tropical countries it presents every variety of climate.