A tidal channel carries ships from the Atlantic to Seville, far inland along the Guadalquivir. That river route opens onto the larger shape of Spain: a high interior plateau, divided by mountain ranges and draining toward both the Atlantic and Mediterranean. The Tagus and Douro run west; the Ebro crosses the northeast, while the Guadalquivir connects Andalusia to the Atlantic. Spain’s watersheds give the country several directions at once, linking regions with different climates, languages and histories within one constitutional state.[20][1][2]

That shared state is younger than many of the places it governs. Its constitution recognises both the unity of the Spanish nation and the autonomy of the nationalities and regions within it. Seventeen autonomous communities and two autonomous cities form a political map that gives regional institutions a real part in public life. The arrangement shows why Spain feels different from one region to another, and why questions of language, memory and authority are part of ordinary national conversation.[3][4]