The Ribagorza reference article from the English Wikipedia on 24-Apr-2004
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Ribagorza

Ribagorza is one of the historical Aragonese counties, collindant with the county of Sobrarbe and the county of Pallars. Its territory was the valleys of the rivers Esera, Isabena, and Noguera Ribagorzana. The historical capital was Benabarre. Nowadays Barbastro have taken precedence as the main center of the area. Some notable towns in the area are: