Chapelle du chêne d'Illwald, Catholic chapel in Illwald forest, Sélestat, France.

The Chapelle du Chêne d'Illwald is a small hexagonal chapel of pale cream plaster set among tall trees, its shallow moss-covered roof carried on six dark wooden posts with overhanging eaves. A narrow round-arched window with a dark grille and small dark plaques mark the walls, and grey stone edges the base and floor.

The site has roots in the 15th century when fishermen discovered a statue of Mary in a boat on the nearby river. Their finding inspired locals to establish a sanctuary at this location, which grew and changed over the centuries.

The chapel brings people together during important religious celebrations like Pentecost Monday, when visitors gather to pray and mark the occasion together. For many in the region, it holds deep meaning as a place of worship that has endured through generations.

Visitors reach the sanctuary by walking forest paths from Selestat, following signs along the Schiffweg waterway through the reserve. The grounds are accessible on foot, and paths are generally in good condition, though sturdy shoes make the walk more comfortable.

Starting in 1843, unmarried men from Selestat took responsibility for maintaining the sanctuary, a practice that continues in modified form today. This bond between the local community and the chapel reveals how deeply it has been woven into the daily life of residents across generations.