Hengsteysee

The Sigiburg was a Saxon hillfort in Western Germany, overlooking the River Ruhr near its confluence with the River Lenne. The ruins of the later Hohensyburg castle now stand on the site, which is in Syburg, a neighbourhood in the Hörde district of Dortmund. Archaeological evidence suggests the site was occupied in the Neolithic era.

The Hengsteysee (Lake Hengstey) is a reservoir on the Ruhr river between the cities of Hagen, Dortmund and Herdecke, North Rhine-Westphalia, Germany. It was built in 1929 and is one of five reservoirs on the Ruhr.The reservoir is about 4.2 km (2.6 mi) long and has an average width of 296 meters (971 ft).

The Lenne is a tributary of the river Ruhr in the Sauerland hills, western Germany. It has caused flooding in recent years.Having its source on top of the Kahler Asten near Winterberg in an intermittent spring at an elevation of 2,687 ft (819 m), the Lenne ends after a course of 129 km flowing into the Ruhr river near the city of Hagen.

The Syberg is a hill in the Ruhr, 244.63 m above sea level (NN), which is part of the Ardey Hills. The Syberg is home to the Hohensyburg, the Vincke Tower, a monument to Emperor William I and other points of interest.The family name of the House of Syberg is derived from the Syberg.

The Klusenberg is, at 254.33 m above NHN, the highest elevation on the territory of the city of Dortmund.The Klusenberg part of the Ardey Hills lies west of the Hohensyburg. To the south its slopes fall away into the Hengsteysee lake. The Klusenberg is wooded with just a few residential houses.