↑Pervaiz I Cheema; Manuel Riemer (22 August 1990). Pakistan's Defence Policy 1947-58. Palgrave Macmillan UK. pp. 46–. ISBN978-1-349-20942-2. In addition, the Soviet Union is separated from Pakistani territory by a small strip commonly known as the Wakhan corridor. Theoretically the Soviet Union does not have a common border with Pakistan but in view of their close linkage with Afghanistan and the shortness of Wakhan's breadth make it an immediate neighbour for all practical purposes.
↑Yasmeen Niaz Mohiuddin (2007). Pakistan: A Global Studies Handbook. ABC-CLIO. pp. 18–. ISBN978-1-85109-801-9. The Chitral and Kalash valleys of the Hindu Kush Mountains are located north of the Swat Valley in the Chitral district of the North-West Frontier Province and are bordered by Afghanistan on the north, south, and west. The Wakhan Corridor separates Pakistan from Tajikistan.The corridor, wedged between the Pamir Mountains to the north and the Karakoram range to the south, is about 350 km (220 mi) long and 13–65 กิโลเมตร (8–40 ไมล์) wide.