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5h, Blue-class hike, Hintersee
This emerald-green lake is surrounded by steep walls of rock, with the 1800-metre east wall of the Watzmann towering above its west shore. Around eight kilometres long and over a kilometre across at its widest point, and with a depth of up to 190 metres, the lake occupies the whole valley between the Watzmann in the west and the Jenner and Gotzenberg in the east. This jewel of the Bavarian Alps is a haven of peace.