The Middle Bridge (German: Mittlere Brücke [common name] / German: Mittlere Rheinbrücke [official name], French: Pont du Milieu) is a historic bridge in the Swiss city of Basel. It is situated on the oldest existing bridge site across the Rhine, between Lake Constance and the North Sea. It also marks the boundary between the High Rhine (Hochrhein) and Upper Rhine (Oberrhein/Rhin Supérieur) sections of the river.