The Hintersee is a small mountain lake in 1313 meters above sea level in the valley of Felbertals in Mittersill. ... Mittersill. Geographical location, Oberpinzgau, Austria. Marvel at mighty cliffs that majestically into the sky in front of you. Merge with the wonderful nature and let the Bergfrieden act on your soul. Hear, see, feel and taste what the Hintersee and the Gamsblickhütte, amid the Hohe Tauern National Park, has at treasures to offer. Immerse yourself in the enjoyment of the Hohe Tauern and enjoy the hospitality of the family of three-Bacher in the cozy Gamsblickhütte!