Afghanistan, republic in south-western Asia, bordered on the north by Turkmenistan, Uzbekistan, and Tajikistan; on the east by China, India, and Pakistan; on the south by Pakistan; and on the west by Iran. Afghanistan is roughly ovoid in shape and has a maximum length, from north-east to south-west, of about 1,455 km and a width of about 730 km. It has an area of 647,497 sq km. The capital and largest city is Kabul.