The Gründel ponds

The Gründel ponds located in the center of a forest crossroads to the north of the Forêt d'Exception® de Haguenau, are called "Grünes Wasser" (the green ponds).
These two shallow ponds were dug at the end of the 1893th century to extract the gravel and sand necessary for the construction of the railway line between Mertzwiller and Seltz, put into service in XNUMX. This line then served the line Maginot before being destroyed during the Second World War. Today cleared of trees and brush, it is used on certain portions as a hiking trail.

From March, these ponds are spawning grounds for several species of frogs and newts.
Around the ponds are oil wells exploited until the 1970s, some of which are still visible.