Afghanistan, officially the Islamic Emirate of Afghanistan, is a landlocked country at the crossroads of Central and South Asia. It is bordered by Pakistan to the east and south, Iran to the west, Turkmenistan and Uzbekistan to the north, and Tajikistan and China to the northeast. Occupying 652,864 square kilometers (252,072 sq mi), the country is predominately mountainous with plains in the north and southwest. It is inhabited by 31.4 million people as of 2020, composed mostly of ethnic Pashtuns, Tajiks, Hazaras, and Uzbeks. Kabul serves as its capital and largest city.