The Champ du Feu (French pronunciation: [ʃɑ̃ dy fø]) is the highest point in the Bas-Rhin, located at Ban de la Roche, at an altitude of 1,098 meters.

The subsoil is composed of granite and is characterized by alpine grassland vegetation as well as peat bogs.

[3] A Roman road leading from the Alsace plain and passing by the current abbey of Hohenbourg on Mont Sainte-Odile is mentioned in 1059 by Strata in connection with the Champ du Feu.

[4] It is referenced in 1382 as Rottenwegescheide (literally: 'the red path that separates') because it locally marked the boundary between the territory of the city of Obernai and the lordship of Ban de la Roche.

[5] A 16th-century boundary stone featuring the coats of arms of Obernai and Rathsamhausen is still located near the Col de la Rothlach.