This river starts in Thuringia, runs through Hesse, and enters Lower Saxony in Hedemünden.
In the year 1210 it was remodeled with a newly designed church surrounded by a large wall so it could be used as a fortress as well.
In 1913 the school moved to a new building 300 m away from the first and in 1930 the municipality of Hedemünden ceded its independence, becoming part of Hann.
Factories of different kinds began to settle in the village for access to the infrastructure (river, Autobahn, and railway).
The village Hedemünden developed a comparatively large industrial area due to its closeness to the Autobahn and the cities of Göttingen and Kassel.
A large distribution center of the German discounter Aldi was built in the 1970s, a cable factory followed in the 1980s and an online retailer in the 1990s.