Languages of Catalonia
There are four languages with official status in Catalonia (an autonomous community of Spain): Catalan; Spanish- which is official throughout Spain; Aranese, a dialect of Occitan spoken in the Aran Valley; and Catalan Sign Language. Many other languages are spoken in Catalonia as a result of recent immigration from all over the world.
Province of Castellón
It is a bilingual territory whose inhabitants speak both Spanish and the local co-official language of Valencian/Catalan. Although Spanish and Catalan are closely related comprehension is limited: the language is a 'bridge' between Western Iberian and Gallo-Italian. There are marked distinctions in vocabulary and grammar which puts Catalan closer to Occitan in southern France and Italian (in frequently used words) which make it difficult for a monolingual speaker of Spanish to understand. Usage is a source of some controversy and political but not to the degree as in Catalonia.