The Darya-Ye Sut has developed a parallel drainage pattern, with streams flowing in one or two general directions. This pattern formed in erosion-resistant but fractured Neogene to Pleistocene sandstones, conglomerates, and siltstones. Parallel drainage patterns tend to develop on steep slopes or on rocks that have been fractured in one or two particular directions. This drainage pattern bears a resemblance to some channel networks on Mars, such as the Warrego Valles.
Dendritic drainage patterns, like those to the north (right), formed on less-resistant Cretaceous limestones and on shallower slopes. Unlike the rocks to the south, there is no dominant fracture pattern in the rocks in this area.
The 800-kilometer-long Hindu Kush range reaches elevations of 7000 meters or more. The Hindu Kush formed during the collision between the Indian and the Eurasian plates. The collision also formed the Himalayan Mountains, and the Kirthar and Sulaiman Ranges of Pakistan. Some of the numerous faults in this tectonically active area control the locations of rivers in the area.
36.0 N, 67.3 E
Large Format Camera
3.1 × Normal