Poets' footbridge over the Quatelbach. This river, which was probably built in the Middle Ages to supply the villages and mills of Modenheim, Sausheim, Baldersheim, Battenheim and Adolsheim (no longer in existence), branches off from the Ill just outside Mulhouse, at the Nouveau Bassin. It joins the Ill again at Ensisheim. Its name comes from Catherine de Bourgogne (Katel in German), wife of the Duke of Austria. It was she who improved the river in 1401, at the time when Ensisheim was the capital of the former Austria (Habsburg possession in Upper Alsace and Baden).