Pakistan’s shortest international border is with China, which stretches approximately 523 to 599 kilometers. According to the latest available figures from the Consulate General of Pakistan, other borders of Pakistan vary in their lengths, but the border with China is the shortest.
China: 523 km (shortest). Recent surveys in Pakistan estimate it to be 599 km.
Iran: 909 km.
Afghanistan: 2,430 km to 2,611 km (the longest, also known as the Durand Line).
India: 2,100 km to 3,323 km (the distance varies considerably in different sources, with or without the inclusion of the Line of Control and Working Boundary).