Pakistan shares longest border with

A. Iran
B. India
C. Afghanistan
D. China

Pakistan shares its borders with four countries:

1. Afghanistan to the northwest, with a border length of approximately 2,670 km
2. Iran to the southwest, with a border length of approximately 959 km
3. India to the east, with a border length of approximately 2,912 km
4. China to the northeast, with a border length of approximately 438 km

In addition, Pakistan also has a coastline along the Arabian Sea to the south, stretching approximately 1,046 km.