Peshawar, also known as Pekhawar, is the capital and largest city of Khyber Pakhtunkhwa, and the administrative centre and economic hub for the Federally Administered Tribal Areas of Pakistan. Peshawar is situated in a large valley near the eastern end of the Khyber Pass, close to the Pak-Afghan border. Known as "City on the Frontier", Peshawar's strategic location on the crossroads of Central Asia and South Asia has made it one of the most culturally vibrant and lively cities in the greater region. Peshawar is irrigated by various canals of the Kabul River and by its right tributary, the Bara River.Peshawar has now evolved into one of Pakistan's most ethnically and linguistically diverse cities. In the last three decades, there has been a significant increase in urban population, in part due to internal migration of people in search of better employment opportunities, education, and services, and in part because of the influx of Afghans and other people displaced by military operations and civil unrest in neighbouring regions. Peshawar is the major educational, political and business center of Khyber Pakhtunkhwa.