Achelous (Ganymede)

Named after the Greek river god; father of Callirrhoe, Ganymede's mother.

Achelous is a fresh crater on Ganymede adjacent to the similarly sized Gula. It has an outer lobate ejecta deposit extending about a crater radius from the rim. A characteristic feature of both craters, almost identical in size, is the "pedestal" - an outward-facing, gently sloped scarp that terminates the continuous ejecta blanket. Similar features may be seen in ejecta blankets of Martian craters, suggesting impacts into a volatile rich target material. (wikipedia entry)

A crater is a circular depression likely created by an impact event. On Ganymede they are named after gods and heroes of ancient Fertile Crescent people.