Best attractions and places to see around Harkortsee include a diverse range of natural and historical sites. This reservoir, situated between Hagen, Herdecke, and Wetter, offers opportunities for water sports, hiking, and cycling. The area features significant landmarks such as viaducts and castle ruins, alongside extensive natural landscapes. Visitors can explore well-developed paths around the lake and through nearby nature reserves.
Last updated: July 6, 2026
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Wetter Castle ruins stand majestically on a hill overlooking Lake Harkort and are among the most historically significant castles in the Ruhr Valley. Their origins date back to the 13th century, when they were built by the Counts of the Mark as a fortified residence. Parts of the medieval structure are still visible today – including the keep, remains of residential buildings, and sections of the curtain wall. Over the centuries, the castle experienced turbulent times: During the Soest Feud (1444–1449), it was besieged and severely damaged. From the 18th century onward, it fell into increasing disrepair until it took on a surprising new role in the 19th century. In 1819, Friedrich Harkort, one of the pioneers of industrialization in the Ruhr region, established one of the region's first machine factories in the ruins – a milestone in early industrial history. Today, the castle ruins are a popular hiking destination with impressive views of Lake Harkort and the Ruhr Valley. Visitors appreciate the blend of nature, history, and panoramic views. Currently, construction work is causing temporary road closures, but the site remains an atmospheric highlight and an ideal place to tell the story of Wetter's development from a medieval castle settlement to an industrial town. https://hagenentdecken.de/kulturntdecken/sehenswuerdigkeitenwahrzeichen/
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Beautiful view 👌
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From here you have a wonderful view of the Harkortsee. Currently (July 24) the paths there are often closed due to construction work
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Ruhr Viaduct The Ruhr Viaduct in Herdecke is an impressive structure and a striking landmark of the Ruhr Valley. It is used by trains between Dortmund and Lüdenscheid. This imposing viaduct stretches over the Ruhr and also marks the beginning of the Ruhr reservoir Harkortsee Here are some interesting facts about the Ruhr Viaduct: Length: The viaduct is 313 meters long. Height: It rises to almost 30 meters above the river. Construction: 24,400 cubic meters of rubble stone and 12 arches with a span of 20 meters each were used for the construction. The bridge construction describes a slight curve with a radius of 380 meters in plan. History: In 1879, the line was inaugurated as part of the Düsseldorf-Derendorf–Dortmund South railway line (also known as the “Rheinische Strecke”) of the former Rhenish Railway Company. The construction of the viaduct in these dimensions was a technical masterpiece for the time. It made it possible to keep the length of the Ender Tunnel on the route as short as possible. Destruction: In May 1943, a pillar of the viaduct was torn away by the ensuing flood wave when the Möhne dam was destroyed by Operation Chastise. In 1945, two arches of the structure were blown up by the Wehrmacht. The viaduct was not rebuilt until 1952 and the first trains were able to cross it in 1957.https://ennepe-ruhr-entdecken.de/poi/ruhr-viadukt/
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Beautiful lake with an easy-to-drive road around it
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The Harkortsee is one of many smaller lakes that are created by barrages in the quiet and are intended to keep the level of the Ruhr stable. A beautiful bike and footpath leads around the Harkortsee. The railway viaduct over the lake is also impressive. The Harkort Tower high above the lake is also worth a visit, as is the climbing forest directly at the Harkort Tower.
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The Harkortsee is a top excursion destination that is not as crowded during the week as it is on the weekend, at least in the summer months
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Around 1250/74 it was taken over by Count Adolf III. built by the Mark and besieged in 1444-1449 by Cologne and Bohemian units as part of the Soest feud. In the 18th century it begins to deteriorate. In 1815 Friedrich Harkort set up a machine factory in the ruins.
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The Harkortsee area is rich in history. You can visit the impressive Ruhr Viaduct at Harkort Lake, a 313-meter long railway viaduct built in 1878. Other significant sites include the medieval Burg Wetter Castle Ruins overlooking the lake, the 13th-century Wasserschloss Werdringen which now houses a museum, and the charming Alt-Wetter Old Town with its well-maintained facades and narrow alleys. Don't miss the Wetter-Freiheit Reformed Church, an architectural landmark in Wetter's old town.
Yes, there are several excellent viewpoints. The View of the Ruhr Viaduct in Herdecke offers a stunning perspective of the 313-meter long viaduct and the surrounding landscape. You can also find breathtaking views from the gentle hills of Kaisberg, located south of the lake, which offers a scenic route with panoramic vistas.
Harkortsee itself is a central natural attraction, offering opportunities for sailing, rowing, and canoeing. The lake is one of six Ruhr reservoirs. The area also features the Kaisbergaue Nature Reserve and the Harkortsee Former Yacht Harbor Nature Reserve, both protecting critical habitats. Additionally, the FFH Area Felsen am Harkortsee (Rocks at Harkortsee) preserves unique rock formations and flora.
The Harkortsee region is ideal for various outdoor activities. Well-developed footpaths and cycle paths encircle the lake, perfect for long walks and bike tours. You can find numerous cycling routes, including easy loops like the "Harkortsee Railway Viaduct – Ruhr Viaduct at Harkort Lake loop from Wetter (Ruhr)" on the Cycling around Harkortsee guide. For mountain biking, explore trails like the "Harkort Tower – Descent at Harkortberg loop from Wetter (Ruhr)" from the MTB Trails around Harkortsee guide. Gravel biking options are also available, such as the "Ruhr Viaduct at Harkort Lake – Harkortsee Railway Viaduct loop from Herdecke" in the Gravel biking around Harkortsee guide.
Many attractions around Harkortsee are family-friendly. The well-maintained hiking and cycling paths around the lake are suitable for families. The passenger ship "Friedrich Harkort" offers scenic tours, which can be a fun experience for all ages. Historical sites like the Harkortsee Railway Viaduct and the View of the Ruhr Viaduct in Herdecke are also accessible and interesting for families.
The warmer months are generally ideal for visiting Harkortsee, as this is when the passenger ship "Friedrich Harkort" operates, offering scenic lake tours. The well-developed footpaths and cycle paths are also most enjoyable during spring, summer, and early autumn for hiking and biking. However, the historical sites and natural beauty can be appreciated year-round.
Yes, well-developed footpaths and cycle paths encircle the Harkortsee, providing excellent routes for long walks and bike tours. The northern shore features an idyllic path from Wetter to Herdecke, which is part of the famous RuhrtalRadweg (Ruhr Valley Cycle Path). The Hagen shore is more untouched and natural, offering a different experience.
Visitors particularly enjoy the combination of natural beauty and historical significance. The impressive Harkortsee Railway Viaduct is a popular spot for photography, with many feeling a sense of stepping back in time. The scenic views, especially from spots like the View of the Ruhr Viaduct in Herdecke, are highly appreciated. The charming Alt-Wetter Old Town also receives praise for its historical architecture and photo opportunities.
Yes, there are important nature reserves in the vicinity. South of the lake, paths meander through the Kaisberg, which is home to the Kaisbergaue Nature Reserve. Additionally, the Harkortsee Former Yacht Harbor Nature Reserve is another key protected area, safeguarding critical habitats and supporting a wide range of species around the lake.
The Cuno Power Plant, located on the Herdecke side of the lake, is a significant part of the region's industrial heritage. While much of its original structure has been replaced, an older administrative building still remains. It stands as a testament to the area's industrial past. While it's a notable landmark, it is primarily an operational facility, and public access to the main plant may be restricted.
Yes, Harkortsee is a central attraction for water sports enthusiasts. The lake offers opportunities for sailing, rowing, and canoeing. During the warmer months, the passenger ship "Friedrich Harkort" also provides scenic tours across the lake, allowing visitors to enjoy the water from a different perspective.
The Ruhr Viaduct at Harkort Lake is an impressive sandstone railway viaduct spanning the Harkortsee between Hagen and Herdecke. Built in 1878, it is 313 meters long, almost 30 meters high, and features 12 semi-circular arches. It's a striking structure, a popular spot for photography, and is also part of the Route of Industrial Heritage, highlighting its historical and architectural importance.


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