Sudeten Mountains, also Sudetes (Czech and Polish: Sudety), a series of relatively low mountain ranges along the border between Poland and the Czech Republic. They extend for about 150 miles (240 km) between the Elbe and Oder river valleys and reach their highest elevation at Snezka (5,256 feet [1,602 m]) in the Czech Republic. Agriculture, forestry, and mining are carried on throughout much of the region. There is also a considerable amount of manufacturing in the many cities of the valleys and basins.