Here in Loch Awe, the longest (41 km) and third largest freshwater lake in Scotland, we see a rock formation with its worn-off shape shining in the blue water. Trout and salmon pass through this lake into the Awe River. In the 1950s, a hydroelectric power station was built in the lake, equipped with a special slow-moving turbine, to let young salmon pass, without harming them. In addition, water is pumped up to a storage reservoir in the hills above Loch Awe, from which water is released at peak hours, to operate four pump generators, located inside the mountain. On some islands in the lake are castle ruins and on a headland on the north side lies one of the most photographed castles in Scotland: Kilchurn Castle.