The Alhama is a tributary of the Ebro. Its source is Suellacabras, in Soria, and it flows for 78 kilometres (48 mi) until its reaches the Ebro at Alfaro (La Rioja).
Coordinates: 42°11′02″N 1°43′05″W / 42.1839°N 1.7181°W / 42.1839; -1.7181