Tannensee is a beautiful reservoir in Obwalden. Located close to Melchsee, Bonistock, Glogghüs, Rotsandnollen, Haupt and Graustock there is something for everyone to discover. Enjoy the breathtaking views while hiking from Melchsee to Tannensee: The path begins in Melchsee-Frutt: 11.7km circular hike, 453m elevation gain, moderately challenging, around 3h39min to complete.