It leaves the Nahang and then goes overland via various mountain ridges and straight-line segments southwards to Gwatar Bay in the Gulf of Oman.

The modern boundary cuts through the region known as Balochistan, an area long contested between various empires centred in Persia (Iran), Afghanistan, and Pakistan.

From the 18th century onwards, the British gradually took control of most of India, including what is now Pakistan, bringing it into close proximity with lands traditionally claimed by Persia.

In 1871, the British (representing the Khan of Kalat) and the Persians agreed to define their mutual frontier; a boundary commission surveyed the area the following year but did not mark the border on the ground.

The project will include large earth and stone embankments and deep ditches to deter illegal trade crossings and drug smuggling to both sides.

[7] However Pakistani Foreign Ministry spokeswoman Tasnim Aslam denied any link between the fence and the bomb blast, saying that Iran was not blaming these incidents on Pakistan.

[11] An opposition leader in the provincial assembly in 2007 said the governments of the two countries should take the people of the area into confidence,[12] and demanded a stop to the construction of the barrier.

Since Iran drives on the right, and Pakistan on the left, the border crossings require road traffic to change sides.