The border was defined more precisely with the Second Sistan Boundary Commission (1903-1905) headed by Arthur Mac Mahon, who had a difficult task due to lack of natural boundaries. The part assigned Persia was included in the province of Balochistan (which took the name of Sistan and Baluchistan in 1986) being the capital Zahedan. In Afghanistan it was part of the Sistan province of Farah-Chakansur that was abolished in the administrative reorganization of 1964 to form the province of Nimruz, with capital Zaranj.
