THEMIS Image of the Day, August 2, 2018. The right angle intersections in this VIS image are some of the graben that form Sacra Fossae. The fossae are located on the margin of Lunae Planum near the beginning of Kasei Valles.
The depressed floors show a few signs of flow along them, possibly from groundwater released when the ground broke open.
Graben are depressions caused by parallel faults where a block of material drops down along the fault face.