Valle de Arán
Geographically, Catalan is understood in northwest Catalonia (High Pyrenees, Aran Valley) by 97.4% of residents, followed by south and western Catalonia, whereas Barcelona's metropolitan area had the lowest knowledge, at 93.8%. The situation is analogous for written-language skills, with central Catalonia scoring the highest percentages (61.4%), and Barcelona the lowest (46.4%).