If you prefer a quieter alternative to the Ottenstein Reservoir , the nearly 90-minute drive to the Kamptal region in Lower Austria — to the “little brother” of the large lake—is well worth it. There you’ll find a largely unspoiled reservoir that welcomes you with dense forests and clear water. The lake not only protects against flooding and water shortages but is also a perfect destination for relaxation and cooling off.
A natural idyll with no admission fees

The reservoir is part of a chain of three dams and is the lowest reservoir on the Kamp River. While other lakes are heavily frequented, here—at an elevation of around 360 meters —you’ll find, above all, peaceful tranquility. After all, there’s no major infrastructure here— just natural shores and free swimming without admission fees.
If you’re looking for an active outing, you can explore the winding coves on a stand-up paddleboard. Plus, the gently sloping shoreline is perfect for a refreshing dip in the cool water before settling down on the picnic blanket you brought along. However, be sure to pack your own snacks and drinks, as there are no restaurants or cafes right on the shore.
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Traces of History Above the Water

A striking feature of this landscape is the Thurnberg ruins, which sit perched on a rocky outcrop directly above the lake. Although the castle dates back to the 13th century, the remaining ruins are still a popular photo spot today. This adds a historical element to the outing, which can be perfectly combined with a short walk.
Although the old paths are narrow in places, the view of the glistening water makes up for the short climb. After taking in the historic stones, you can then hike along the shore to the massive dam wall. This allows you to extend your visit to several hours if you’d like to explore the area thoroughly.
As a result, the area offers nature lovers and those seeking peace and quiet a perfect combination of water, forest, and history. So if you ’re planning a relaxing day in nature soon, this trip to the Waldviertel is worth considering. In any case, the journey is well worth it for anyone who appreciates nature away from the crowds.