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The Hindu Kush and subsidiary ranges divide Afghanistan into three distinct geographic regions, which roughly can be designated as the Central Highlands, the Northern Plains, and the Southwestern Plateau. The Central Highlands, actually a part of the Himalayan chain, include the main Hindu Kush range. Its area of about 160,000 square miles is a region of deep, narrow valleys and lofty mountains, some peaks of which rise above 21,000 feet. High mountain passes, generally situated between 12,000 and 15,000 feet above sea level, are of great strategic importance and include the Shebar Pass, located northwest of Kabul where the Baba Mountains meet the Hindu Kush, and the Khyber Pass, which leads to the Indian subcontinent, on the Pakistan border southeast of Kabul. The Badakhshan area in the northeastern part of the Central Highlands is the location of the epicentres for many of the 50 or so earthquakes that occur in the country each year. The Northern Plains region, north of the Central Highlands, extends eastward from the Iranian border to the foothills of the Pamirs, near the border with Tajikistan. It comprises 40,000 square miles of plains and fertile foothills sloping gently toward the Amu River (the ancient Oxus River). This area is a part of the much larger Central Asian steppe, from which it is separated by the Amu River. The average elevation is about 2,000 feet. The Northern Plains region is intensively cultivated and densely populated. In addition to fertile soils, the region possesses rich mineral resources, particularly deposits of natural gas. The Southwestern Plateau, south of the Central Highlands, is a region of high plateaus, sandy deserts, and semideserts. The average altitude is about 3,000 feet. The Southwestern Plateau covers about 50,000 square miles, one-fourth of which forms the sandy Rigestan Desert. The smaller Margow Desert of salt flats and desolate steppe lies west of the Rigestan Desert. Several large rivers cross the Southwestern Plateau; among them are the Helmand River and its major tributary, the Arghandab. Most of Afghanistan lies between 2,000 and 10,000 feet in elevation. Along the Amu River in the north and the delta of the Helmand River in the southwest, the altitude is about 2,000 feet. The Sistan depression of the Southwestern Plateau, 1,500 to 1,700 feet in elevation, was the seat of a flourishing ancient civilization that was ended in the 14th century by Timur (Tamerlane).
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