Park Krajobrazowy “Dolina Słupi” (Słupia Valley Landscape Park), established in 1981, protects the valley of the River Słupia in Pomerania. Forests cover about 72 per cent of its area. At the heart of the park lies Gałąźnia Mała, home to one of the oldest hydroelectric power stations in this part of Europe, completed in the 1920s. We created a mobile app for Android and iOS phones with an audio guide to the nature trail in Gałąźnia Mała. The recordings accompany the walk and tell the story of the valley’s nature, and the trail can be explored at your own pace.