Hangeweiher Lake

Designed as a public park, a small dam fed by the Pau, the Hangeweiher, was redesigned as a Kahnweiher. This had already been created in the 18th century as Aachen's first rainwater retention basin and served as a water reserve for the cloth factories in Aachen at the beginning of the 19th century.

This highlight should actually be called "Kaiser-Friedrich-Park" because the park and the Hangeweiher form a unit. Let's leave it at Hangeweiher, which is better known in Aachen and the surrounding area.
The Kaiser-Friedrich-Park is a park in the south of Aachen, named after the German Emperor Friedrich III, who died in 1888. was named.
The park was laid out together with the adjoining Kaiser-Friedrich-Allee between 1908 and 1910 according to the plans of the Aachen city garden director Weßberge. For this purpose, the park was furnished with rare trees from the stocks of the Aachen cloth manufacturer and amateur dendrologist Friedrich von Halfern, who had already had the family's Von Halfern Park laid out.
Conceived as a public park, a small dam fed by the Pau, the Hangeweiher, was redesigned as a Kahnweiher. This had already been created in the 18th century as Aachen's first rainwater retention basin and served as a water reserve for the cloth factories in Aachen at the beginning of the 19th century.
Originally, a soccer field in the west of the park and two children's playgrounds supplemented the green area. The horticultural concept envisaged the installation of terraced flower beds, which gave the impression of a closed garden area, but at the same time were clearly visible.
Weßberge designed the 6.7 hectare park in the style of an English landscape garden. A valuable stock of trees with trees that are now more than a hundred years old, such as a white willow (1904), a cake tree (1904), a cord tree (1907) and a silver maple (1907) characterize the green area in addition to various flower borders. In addition to the native songbirds, black-headed gulls, ravens and crows, the park's avifauna includes various water birds such as mallards, mute swans, coots, moorhens, Nile and Canada geese, musk ducks and pochards.
The first 2 sentences by me, the great rest of
de.wikipedia.org/wiki/Kaiser-Friedrich-Park

The 67,000 square meter Kaiser Friedrich Park with the hanging pond in it is one of the largest inner-city local recreation and leisure facilities in Aachen. It shapes the south of the city and, with its foothills along the Kaiser-Friedrich-Allée and the green spaces on the Scherpenberg, is directly connected to the Aachen Forest at the level of the Waldschenke. This route can be walked almost entirely through green and forest areas.