The Stadtwaldsee is an excavation lake in Bremen, Germany. It is commonly known as the Unisee due to its proximity to Bremen University. At an elevation of 1 m, its surface area is 28.2 ha.
Wikipedia https://en.wikipedia.org/wiki/Stadtwaldsee_(Bremen)
Address 28359, Germany
Coordinates 53°6'42.66" N 8°49'47.859" E