Alto Trás-os-Montes is a Portuguese subregion (NUTS level 3) integrated in the Norte region. It aggregates 14 concelhos (municipalities) with a total area of 8,168 km² making it one of the largest Portuguese subregions. The main urban centers are Bragança (pop. 20,000), Chaves (pop. 22,000) e Mirandela (pop. 11,000).