Nationalities and regions of Spain
Spain is a diverse country integrated by contrasting entities with varying economic and social structures, languages, and historical, political and cultural traditions. The Spanish constitution responds ambiguously to the claims of historic nationalities (such as the right of self-government) while proclaiming a common and indivisible homeland of all Spaniards.
Source: Wikipedia — Nationalities and regions of Spain (CC BY-SA 4.0)