I did some research regarding yr question without success. There are 2 streets name that include the word RIO one is "Rio Segura" and the second "Rio Madera".
You should put the question to the Town Hall in Orcera, perhaps they give you some clues.
Cuan sabio es aquél que cree que aun le quedan cosas por aprender.
Cuan ignorante es aquél que no reconoce su ignorancia.