Original: Borders Afghanistan has a total of 5,529 km of borders, including the land area borders, with the longest being the 2,430  border with Pakistan (the Durand Line) to the south and southeast, followed by a 936 km border with Iran to the west.
Simplified: Borders Afghanistan has a total of 5529 km of borders - the longest part of the border (2,430km) is known as the Durand Line and forms Afghanistan border with Pakistan.