Terra Alta is the most westerly of Catalonia’s DOs which are clustered around Barcelona and include Alella, Conca de Barberá, Costers del Segre, Empordà (on the border of France), Montsant, Penedés, Plà de Bagés, Priorat (DOPQ) and Tarragona. Both Cataluña and Cava are broader designations that also apply to the Catalonia region.