Best natural monuments around Harrislee are characterized by their location on the Flensburg Fjord and proximity to the Baltic Sea. The region features a mix of sandy beaches, serene lakes, and protected natural areas. This landscape offers opportunities for outdoor activities and observing local flora and fauna. The area's natural features contribute to its appeal as a destination for gentle exploration.
Last updated: May 11, 2026
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Lake Niehuuser – also called Niehuussee – is located in the municipality of Harrislee in the Schleswig-Flensburg district, directly on the German-Danish border between Niehuus and Padborg. Nestled in a charming natural landscape, it is a beautiful local recreation destination and invites you to take leisurely walks around the water. The lake is part of the cross-border Krusau Tunnel Valley, a gently rolling landscape with damp valley floors, springs, and alder swamp forests that stretches along the border river Krusau. Accordingly, the area is part of a FFH conservation area and therefore enjoys a high ecological protection status. Visitors can enjoy pleasant hiking and circular trails – such as a 5.6 km route around the lake, which can also be found as a circular hike on platforms such as RouteYou. The western side of the lake already marks the border with Denmark, giving the walk a particularly charming, border-oriented perspective. The lake is particularly popular with photographers – it is considered an atmospheric subject, especially in the evening with its charming light. Furthermore, the ASV Petri Heil Flensburg is committed to accessibility: a barrier-free jetty was recently built, making access to the water easier.
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Sankelmarker Lake is a natural body of water from the last ice age, which is now fed by two streams and various springs on the banks and bottom. This constant supply of fresh water has ensured the excellent water quality of the relatively deep, clear lake in recent years. Ideal conditions for fishing at Sankelmarker Lake. Due to the extreme nutrient input from the surrounding agriculture, however, there is an increasingly explosive proliferation of phytoplankton in the summer months, which pollutes the water. It is then also not possible to swim at Sankelmarker Lake. The banks are largely covered with trees and very difficult to reach. There are jetties, but almost all of them belong to private property. There are a few free bays on the south bank. A boat can be launched here. Fishing at Sankelmarker Lake from a boat
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A small tour takes you around Lake Sankelmark. Hiking tour "Water experience": The hiker is guided over 4.2 km for around 90 minutes, always directly on the water. Enjoy the special atmosphere of the lake and listen to the sound of the small waves. Seabirds can be observed with the observation telescope. The academy center is also worth a visit.
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The Roikier See (also: Roikiersee) is a forest lake that is part of the Groß-Tremmerup forest near Glücksburg (Baltic Sea). It is approximately 3.6 hectares in size and is probably the only real forest lake in the fishing region. The Roikier See was created in the 13th century from a moor area cleared by monks from the Cistercian monastery in Glücksburg at the time. The lake was used for fresh water supply and carp breeding. Source: https://de.wikipedia.org/wiki/Roikier_See
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Nice shallow lake, we saw a gray heron.
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Beyond the well-known spots, Harrislee offers a variety of natural features. You can discover the unique ecosystem of the Twedter Feld Nature Reserve, known for its impressive biodiversity including over 100 bird species and more than 700 mushroom species. Another distinct feature is the Western shore of Lake Roikier, which is considered the only true forest lake in the fishing region, created by monks in the 13th century.
Yes, the region combines natural beauty with historical elements. For instance, Lake Roikier was originally dammed by Cistercian monks in the 13th century for fresh water and carp farming. Additionally, you can visit The King's Oak at Glücksburg Castle, an imposing tree that was a favorite spot of the Danish king.
Many natural monuments around Harrislee are family-friendly. The Western shore of Lake Roikier and Niehuussee are both great options, offering serene environments for gentle exploration. Wassersleben Beach, while not a listed highlight, is also highly recommended for families due to its fine sand, calm shallow waters, and a playground directly on the sand.
Yes, some natural monuments are dog-friendly. For example, the Western shore of Lake Roikier is listed as dog-friendly. Additionally, Wassersleben Beach permits dogs during the off-season, typically from November to March.
The area around Harrislee offers diverse outdoor activities. You can enjoy hiking, gravel biking, and running. For detailed routes and guides, explore options like Hiking around Harrislee, Gravel biking around Harrislee, or Running Trails around Harrislee.
Yes, several natural monuments feature hiking opportunities. A small hiking trail encircles Niehuussee, which is located within a nature reserve and borders Denmark. The Twedter Feld Nature Reserve also has trails for exploring its diverse ecosystems. For more hiking options, check out the Hiking around Harrislee guide.
The best time to visit largely depends on your preferred activities. For swimming and sunbathing at Wassersleben Beach, the summer months (June to September) are ideal, often with lifeguard supervision. For hiking and exploring nature reserves like Twedter Feld, spring and autumn offer pleasant temperatures and vibrant scenery. Dogs are permitted on Wassersleben Beach during the off-season (November to March).
The natural monuments around Harrislee are rich in wildlife. The Twedter Feld Nature Reserve is particularly notable, with over 100 bird species observed, including wrens, tits, and warblers. It's also home to over 700 mushroom species and a diverse array of flowering plants. You might also spot swans at Niehuussee.
Yes, several locations offer excellent views. The Western shore of Lake Roikier, Sankelmarker Lake, and Niehuussee all provide picturesque viewpoints, often overlooking the lakes and surrounding landscapes. Wassersleben Beach also offers lovely views across the Flensburg Fjord towards the Danish coastline.
Wassersleben Beach is Harrislee's primary natural gem, known as Germany's westernmost Baltic Sea beach. It features fine sand and calm, shallow waters, making it ideal for families. Its location on the Flensburg Fjord provides picturesque views towards Denmark, and the area is perfect for relaxation, walking, and cycling along its recently enhanced promenade.
For gentle walks, the areas around the lakes are often suitable. A small hiking trail encircles Niehuussee, offering an easy stroll within a nature reserve. The promenade at Wassersleben Beach also provides a flat and accessible path for leisurely walks with scenic views.


Extend your search for the best caves by checking out these guides of the top ones around Harrislee: