Afghanistan is about the same size as the state of Texas in the United States. It is bordered on the north by Turkmenistan, Uzbekistan, and Tajikistan. It is bordered on the south by Pakistan and it is bordered on the west by Iran. The Hindu Kush mountain range runs east to west of Afghanistan, making it split in half. The Hindu Kush mountain range has a height of about 24,000 feet (7,315 meters). Most of the country is covered by high snow capped mountains and is transversed by deep valleys. The overall population of Afghanistan is 31,056,997 (2006) and has a growth rate of about 2.7%. The capital of Afghanistan is Kabul and the primary languages are Dari Persian, Pashtu, and Turkish. The primary religion is Islam. The official name of Afghanistan is the Islamic Republic of Afghanistan.