Tarnak River
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Through Afghanistan and Quaternary
It rises in Afghanistan's highlands region of Hazarajat, near 33°7′N 67°56′E / 33.117°N 67.933°E, south of the Lomar Pass. The Tarnak flows in a south-westerly direction for around 350 km before joining the Dori River some 30 km downstream of the Dori-Arghastan confluence, and some 30 km upstream of the Dori-Arghandab confluence, at 31°24′N 65°33′E / 31.400°N 65.550°E. The combined waters of these rivers join the Helmand at 31°27′N 64°23′E / 31.450°N 64.383°E, near Lashkargah.
Geography
The Tarnak River valley is a tectonic trough that runs from northeast to southwest. It has multilayered aquifers and both Quaternary and Neocene deposits.