Cofio River is a

tributary A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drainage ...

of Alberche River,

Spain , image_flag = Bandera de España.svg , image_coat = Escudo de España (mazonado).svg , national_motto = ''Plus ultra'' (Latin)(English: "Further Beyond") , national_anthem = (English: "Royal March") , i ...

. Featuring a total length of 51 km, it drains a basin area of 638.2 km².

References

;Informational notes ;Citations Rivers of Spain Rivers of Castile and León Rivers of the Community of Madrid Tagus basin Tributaries of the Alberche {{Spain-river-stub