calm autumn alps mountain lake with clear transparent water and reflections. spiegelsee or mittersee or mirror lake, reiteralm,

alpine alps austria autumn beautiful blue calm clouds dachstein dusk europe fall fir forest hiking lake landscape mirror mittersee mountain nature outdoor park path peak picturesque pine reflection reiteralm rock scenery schladming sky spiegelsee spruce steiermark stone stony sun sunrise sunset sunshine tourism tranquil travel tree vacation view water