Map number 0081 covering Potes, Spain. The towns/villages include: Potes, Ojedo, Cabezon de Liebana, Cahetho, Camaleno, Pesaguero, and Portilla de la Reina. The MTN50 (Mapa Topográfico Nacional) series from CNIG (The Centro Nacional de Información Geografica) provide topographic coverage of mainland Spain at 1:50,000 – the Spanish equivalent of the Ordnance Survey Landranger series.