This rugged terrain is part of Galileo Regio, a large area of dark terrain on Jupiter's large icy satellite Ganymede. Dark terrain is the oldest preserved terrain on Ganymede and is heavily cratered. Several intersecting furrows are also visible in this view (lower center and upper right). Furrows are parallel and intersecting linear troughs 10–30 kilometers across with raised rims. They are probably extensional fault valleys and may be the remnants of a very large ancient impact basin. The rounded topography of the troughs, craters, and hills in this region indicate that this terrain has been eroded. This erosion may involve the downslope creep of rock-rich material into the lowlands, exposing ice-rich material on the hills.
images 349759026, 359944739.