Explanation

According to the Survey of Pakistan 2021, the new length border between Pakistan and Afghanistan is 2611 km

The old length between Pak vs Afghanistan is 2430

Pakistan and Afghanistan are called the Durand Line

The Durand line was drawn in 1893 

Durand line agreement between Mortimer Durand and Abdul Rahman.

Additional information:

Pakistan's total land border is 6219KM long

Pakistan's total land border with Land Border + Sea 7277KM

Land Border + Sea + LOC & Working Boundary 8340 KM

Pakistan borders India 2100 KM long in the east

Afghanistan border is 2,611 KM long in the west (northwest)

Iran border is 909 KM long also in the west

China's long border is situated in the northeast.

The beach of the Arabian Sea 1058 km forms its southern border.