Claim: Plana Alta is in Castelló, a province in the northern part of the Valencian Community in Spain, has a total area of 957.29 km.
Evidence: Plana Alta is a comarca in the province of Castelló in the Valencian Country (Spain). 957.29 km (369.61 sq mi) Castellón (Spanish: [kasteˈʎon) officially in catalan Castelló) is a province in the northern part of the Valencian Community. Spain