The Rhine in Basel is extremely clean, thousands of inhabitants of Basle therefore use the Rhine for swimming. There are lovely shore zones next to public bathing-huts which invite to the relax after the bath.
Gaze in admiration at the old town of Basel from the Rhine. You swim at the Basle minster past, under old bridges by and be able to enjoy a delicious ice cream or coffee in one of the many street restaurants in Basel then.