Inside Hale Crater (CTX Frame; Natural Color credits: Lunexit)

Channels associated with Impact Craters were once thought to be quite rare. Scientists proposed a variety of unusual circumstances to explain them, such as impacts by Comets or precipitation caused by the impact event. As more of Mars is photographed with High-Resolution imagery, more craters surrounded by Channel Systems are being discovered.

The Channels in this HiRISE image are from Hale Crater, an exceptionally well-preserved 125 x 150 Km (approx. 78 x 93 mile) Impact Crater located on the Northern Rim of the Argyre Basin.
Hale Crater is roughly 170 Km (a little more than 100 miles) to the South/East.