The Western Sudetes (Polish: Sudety Zachodnie; Czech: Krkonošská oblast; German: Westsudeten) are a geomorphological macroregion, the western part of the Sudetes subprovince on the borders of the Czech Republic, Poland and Germany. They are formed mostly by mountain ranges. They stretches from the Bóbr river in the east to the Elbe and the Elbe Sandstone Mountains in the west.