Hintersee-Felber Ache, Natural monument in Mittersill, Austria.
Hintersee-Felber Ache is a mountain lake in Mittersill surrounded by steep valley walls and dense forest. A network of hiking trails connects different viewpoints and explores the landscape around the water and surrounding slopes.
The lake formed due to a mountain collapse in the late medieval period and was later protected because of its ecological value. This early recognition of such alpine natural features reflected growing awareness of mountain preservation.
The name refers to its location between mountain peaks and the river valley, with alpine farming shaping the area for generations. Visitors can observe how the mountain meadows and simple mountain huts continue this tradition today.
The area is best explored on foot using the marked hiking trails, which offer different difficulty levels. Visitors should arrive early as the narrow valley floor has limited space for larger groups.
The lake is fed by several waterfalls that plunge from the valley walls above, becoming especially dramatic after snowmelt. These cascades are visible only from specific hiking spots and reward patient exploration of the trails.
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