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In page National and regional identity in Spain:

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Aragon has its own language, Aragonese, with about 25,000 speakers, mainly in the mountainous north[5] while Castilian is spoken in the southern two-thirds and Catalan is spoken along the eastern strip. Because of the prevalence of Castilian and the presence of Catalan, the language does not play as large a role in Aragonese identity as in some other locations,[6] but it does enjoy some official recognition.[7]