Arratia may also refer to: Arratia (surname), a family name from Basque Country Arratia-Nerbioi, a comarca in the province of Biscay, in Basque Country, Spain , a Basque Country river flowing into the Ibaizabal River Arratia Valley, a valley in Biscay, named for the river running through it , a historic administrative division in the Lordship of Biscay (), a municipal association () in the province of Biscay, in Basque Country, Spain
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