Zamora

It is the Douro River that characterizes the geography, dividing the borders within the district, its southern frontier and extreme northeast borders with Spain. Its in the Douro valley that the lowlands of the district are primarily located, although almost all are 400 metres above sea level, with the exception of the municipality of Mirandela and its rivers. In addition to the Douro, the rivers of the district run north to south (or northeast to southwest) within the Douro watershed. The principal rivers are the Tua River, which springs from the mountains of Mirandela, at the confluence of Tuela and Rabaçal Rivers, and the Sabor River, which springs in Spain, and crosses the eastern part of the district. Both rivers have a network of tributaries, such as the Baceiro River (feeding the Tuela), the Mente River (serving the Rabaçal), and the Azibo River (supporting the Sabor).