Between Kuhsan and Zulfikar it forms the boundary between Afghanistan and Persia, and from Zulfikar to Sarakhs between Russia and Persia.
Zulfikar, where the boundary leaves the Hari Rud, is about 70 m.
The rest of the country was split up among Turcoman tribes, such as the Zulfikar in Marash and the Al-i-Ramazan in Adana.
Beginning with the Persian border at Zulfikar on the Hari Rud river, the boundary between Afghanistan and Russia follows a line roughly parallel to the course of the Paropamisus, and about 35 m.
From this point to Zulfikar the Hari Rud is itself the boundary.