Country of some 647,500 sq. km in the middle of the steppe and desert zone of Eurasia. It is bounded on the north by the Amu (Oxus) River and the republics of Central Asia, on the west by Iran and on the south and east by the Indian subcontinent. In the Pamir Mountains to the north-east, a narrow tongue of land known as the Wakhan corridor links the country with China (see fig.). Located at the crossroads of major trade and migration routes between the Mediterranean, Central Asia, India and China, the region has been subjected to diverse cultural influences throughout its history.
The physical geography of Afghanistan is very varied and includes formidable mountain ranges, fertile valleys and barren deserts. The dominant mountainous core is the Hindu Kush, an extension of the Karakoram and Pamir mountains that stretches south-west for some 965 km and has peaks rising to some 5180 m in height. To the north, between the Hindu Kush and the Amu River lie the semi-desert plains of Turkestan. South of the Hindu Kush is a transitional zone of plateaux with broad mountain valleys. To the west and south-west the mountains gradually descend to the stony and sandy deserts of the Iranian plateau. North of Kabul the Kuh-e-Baba range (‘Grandfather Mountains’) of the Hindu Kush is the watershed for four great Afghan rivers: the Kabul River flowing east to the Indus, the Kunduz flowing north into the Amu River, the Hari Rud flowing west to Herat and the Helmand, which flows southwards into the marshy lake of Hamun Helmand in Sistan. There are several passes through the mountainous core of the country linking north to south and east to west, and traffic is also channelled along the rivers or round the mountain mass. The low-lying plains and deserts between Herat and Kandahar provide an easy route for traders and invaders travelling eastwards into the Indus Valley....