Lahnfenster

The Lahnfenster is an observation building on the Lahn River in Gießen equipped with large glass windows to watch fish underwater. The windows let visitors see clearly the different fish species that swim through the river passage at the Klinkel'sche Mühle weir.

The building was created in connection with the 2014 Landesgartenschau as part of an environmental education project in Gießen. The facility was developed to promote understanding of the Lahn River's ecology and its importance for the region.

The building demonstrates how residents of Gießen connect with their river and take interest in aquatic life. Visitors experience not just the fish but also how the community values the waterway as a natural part of their town.

The building is accessible during regular opening hours and offers a comfortable way to watch fish without entering the water. The observation windows are placed at accessible heights so visitors of all ages can enjoy the view of the river passage.

The building features a fish ladder system that lets fish overcome the weir and travel upstream in the river. This system helps researchers document and understand the seasonal migration patterns of different fish populations.