That one is afforded by the narrow valley of the Hari Rud to the west of Herat.
South of the Middengebergte, however, the northern affluents of the Batang Hari, the Seliti, Gumanti, Si Potar, Mamun and Pangean, at least those in the west, again run in longitudinal valleys.
These affluents and the Batang Hari itself (except the part at the mouth, Mamun-Simalidu) are navigable only by praus drawing not more than in.
By military expeditions (1890-95) the Dutch influence on the Batang Hari, or Upper Jambi, was increased; as also in 1899 in the Lima Kotas 1 in central Sumatra, included within the territory of Siak.
From its source to Obeh the Hari Rud is a valley of sandy desolation.
