Serra de, in Portugal, a mountain chain, consisting of a spur of the mountains of Asturias, and running between the basins of the Douro and the Minho to the W. of Montalegre. This Serra is the finest in N. Portugal, except the Seajo. It is generally composed of a succession of lofty granite peaks, and stretches about 20 miles from N. to S. The Murro de Buracouro, 4296 feet above sea-level, is the culminating point. On his retreat before Wellington in 1809, Marshal Soult led his army through a terrific gorge forming one of the passes in this chain.