Natural monuments around Wahlstorf are primarily defined by the expansive Großer Plöner See, situated within the Holstein Switzerland Nature Park. This region features a landscape shaped by glacial activity, characterized by rolling hills and over 200 lakes. The area offers a rich biodiversity, serving as a vital ecosystem and a significant breeding ground for numerous bird species. Visitors can explore a variety of natural features, from large lakes to specific viewpoints and islands.
Last updated: July 8, 2026
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On the mirror-like surface of the lake, the shadows of the trees danced, while on the opposite shore, the first lights of the houses twinkled like tiny stars. A rowboat, moored all day, rocked almost imperceptibly. In that moment, time seemed to stand still, and the Dieksee became the perfect place to let the day end in peaceful serenity.
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The Dieksee is a lake in Holstein Switzerland. It covers 386 hectares, has a maximum length of approximately 3.4 km and a maximum width of 1.6 km. The lake is up to 38 m deep and lies approximately 22 m above sea level. The Schwentine River flows through it from east to west.
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A small narrow bridge
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Discover Holstein Switzerland from the water Come aboard the white fleet and discover the unique natural landscape of Holstein Switzerland! On the beautiful 5-Lakes Cruise or Kellersee Cruise, you'll experience Holstein Switzerland from a completely new perspective. Lake cruises are an experience not only on warm summer days, but also in inclement weather. On our heated boats – some with catering – even the dreariest rainy day can be enjoyed.
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In Plön and the surrounding area, there are cormorant colonies that sometimes cause damage to vegetation and fisheries. The island of Sterin in the Great Plön Lake is a well-known example of the destructive effect of cormorant droppings, which virtually destroy vegetation. There was also a cormorant colony on an island in Lake Selent, which was later abandoned and subsequently recovered.
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In the west of the island is the approximately 100-meter-wide sandy beach. The gently sloping shore offers ideal bathing conditions for children. In summer, a DLRG post is manned here. But adults also experience the purest holiday atmosphere. With lush forest in the background, you have a relaxing view of the lake landscape. Small islands interrupt the calm surface of the water, in which the sun reflects when the weather is nice. Canoes, boats and stand-up paddlers move across the lake and take disturbing thoughts of everyday stress with them. This makes the island a place to switch off and recharge.
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Beach between the Princes' Island in the Great Plön Lake with a sandy beach and DLRG. At the end of the idyllic Princes' Island is the natural beach with a view of the sunset included. As a destination for a day trip or a rest stop, you should not miss the approximately 100 m wide, gently sloping sandy beach. The bathing area can only be reached on foot, by bike or by excursion boat. The bathing area is guarded by the DLRG and has a kiosk, toilet, shower, playground and in summer also a volleyball net. Parking spaces are located on the Ascheberger Chaussee (approx. 2 km to the bathing area).
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The Great Plön Lake attracts visitors in summer with bathing areas and good water sports opportunities. In addition to beautiful hikes and boat trips, a stroll through the small town of Plön is also worthwhile. With an area of around 28 square kilometers, the Great Plön Lake is the largest inland body of water in Schleswig-Holstein.
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The natural monuments around Wahlstorf are centered around the expansive Großer Plöner See. Highly regarded spots include Prinzenbad Beach, Prinzeninsel, which offers views of Plön Castle, and Empress's Favorite Spot – Prinzeninsel, known for its beautiful sunset views. Another significant site is Sterin Island (Großer Plöner See), recognized for its ecological importance within the lake.
The region is characterized by the Großer Plöner See, the largest and deepest lake in Schleswig-Holstein, formed during the last ice age. You can explore various islands within the lake, such as those in the Störland Peninsula Nature Reserve, and enjoy the scenic hilly landscapes of the Holstein Switzerland Nature Park. The area also features numerous smaller lakes and rivers like the Schwentine.
Yes, many natural monuments are suitable for families. Prinzenbad Beach, Prinzeninsel and Prinzenbad Beach, Lake Plön are excellent for swimming and relaxation. The entire Prinzeninsel offers easy walking paths. The Schwentine Bridge Timmdorf is also family-friendly and part of pleasant trails.
The Großer Plöner See offers a wide range of activities including swimming, sailing, diving, and fishing in designated areas. Boat rentals are available for canoes, kayaks, sailboats, and stand-up paddleboards. For land-based activities, you can find numerous hiking and cycling routes. For example, explore easy hikes like the 'View of the Lake – Highland cattle at Lanker Lake' or 'Wahlstorf Manor – View of Lake Lanker'. You can find more options in the Hiking around Wahlstorf guide or the Road Cycling Routes around Wahlstorf guide.
The natural monuments are beautiful year-round, but the warmer months from spring to early autumn (May to September) are ideal for water activities like swimming, sailing, and boat tours on Großer Plöner See. During this period, the weather is generally pleasant for hiking and cycling. Autumn offers stunning foliage, while winter can provide a serene, quiet experience, though some facilities might be closed.
Yes, particularly the Prinzeninsel. It was purchased by Emperor Wilhelm II in 1910 and remains owned by the House of Hohenzollern. The island was where the sons of the last emperor learned about farming, and Empress Auguste Victoria had her idyllic favorite places there, such as Empress's Favorite Spot – Prinzeninsel.
The Großer Plöner See is a vital ecosystem and a significant breeding ground for numerous bird species. It's a crucial stop along the main migratory route for Nordic birds. You can observe waterfowl such as greylag geese, goldeneyes, goosanders, and various duck species. The majestic white-tailed eagle (Haliaeetus albicilla) also uses the lake as its hunting territory and can often be seen circling.
For stunning vistas, visit Empress's Favorite Spot – Prinzeninsel, especially for sunset views over the lake. Prinzenbad Beach, Prinzeninsel also offers wonderful views of Plön Castle. The Schwentine Bridge Timmdorf provides picturesque views of the surrounding water landscape.
Yes, the Holstein Switzerland Nature Park, which encompasses Großer Plöner See, offers a wide array of recreational activities, including 27 signposted circular routes around the lake. You can find various hiking options, from easy strolls to more moderate trails. Check out the Hiking around Wahlstorf guide for detailed routes.
While many islands within the Störland Peninsula Nature Reserve are not directly accessible to protect wildlife, boat tours on the lake allow visitors to experience the island world along designated routes. Prinzeninsel, being a peninsula, is easily accessible via a scenic path from Plön's town center.
The Großer Plöner See is significant due to its size as the largest and deepest lake in Schleswig-Holstein, its glacial origins, and its role as a vital ecosystem. It serves as a crucial breeding ground and migratory stop for numerous bird species, including the white-tailed eagle. Its extensive shallow water zones and sheltered areas create exceptionally attractive habitats for waterfowl, contributing to its high biodiversity.
Visitors frequently praise the scenic beauty and rich biodiversity of the area. Many enjoy the tranquility and the opportunity to connect with nature, whether through observing rare bird species, relaxing on the beaches, or engaging in water sports. The picturesque landscape, shaped by glacial history, provides a serene backdrop for outdoor adventures, and the views of Plön Castle from Prinzeninsel are often highlighted.


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