From the junction of the boundary with the Oxus at Khamiab about 150 m.
From Lake Victoria (Sor-Kul) in the Pamirs, which was originally reckoned as the true source of the river, to Khamiab, on the edge of the Andkhui district of Afghan Turkestan, for a distance of about 680 m., the Oxus forms the boundary between Afghanistan and Russia.
Below Khamiab it follows an open and sluggish course till it is lost in the Sea of Aral, being spanned at Charjui, 150 m.
Below Khamiab, by the wooden bridge which carries the Russian railway from Mer y to Samarkand.
At Khamiab the river is probably rather less than Soo ft.
Above Khamiab, where the Russo-Afghan 6 °'boundary touches the river, through the districts which are best known by the name of Khwaja Salar, and again in a less degree for 50 m.
There was a district of that name extending from Khamiab to the neighbourhood of Kilif, and at the Kilif end of the district was a ziarat sacred to the Khwaja who bore the name.
Below Khamiab, to its final disappearance in the Aral Sea, the great river rolls in silent majesty through a vast expanse of sand and desert.
The boundary meets the Oxus at Khamiab at the western extremity of the cultivated district of Khwaja Salar, and from that point to the eastern end of Lake Victoria in the Pamirs the main channel of the Oxus river forms the northern limits of Afghanistan.