Darya-Ye Sut
Afghanistan, Earth

PARALLEL DRAINAGE
The Darya-Ye Sut river system originates in the foothills of the Hindu Kush mountains and has carved a parallel drainage pattern in erosion-resistant sandstones, conglomerates, and siltstones. Parallel ridges may indicate fracturing of the rock in one or two directions and structural control of the development of river channels. Similar drainage patterns, such as Warrego Valles, have formed on Mars.
DENDRITIC DRAINAGE
A dendritic drainage pattern developed in the north half of the scene in less-resistant, more gently sloping rocks.
FAULT
A prominent fault cuts diagonally across the scene. This fault formed a topographic ridge, which has apparently influenced the course of several rivers that run parallel to the fault.