The Wiese crosses into the county of Lörrach just below its source. It flows through the Black Forest, initially in a southwest direction along the B 317 through the Wiesental valley. Leaving from the Feldberg, it flows, hemmed in by the steep mountainsides of the High Black Forest, past the hamlets of Fahl and Brandenberg, still as a mountain stream, and through the village of Todtnau. From there it heads to and through Badnau, past Geschwend, through the villages of Utzenfeld, Schönau im Schwarzwald, Wembach, Fröhnd, Mambach, Atzenbach and Zell im Wiesental.