With the Trettachspitze in view, this bike or hiking tour leads upstream along the Trettach to the Christlessee.
And if you want, you can continue to Spielmannsau. This is the first section for the famous E5 Alpine crossing from Oberstdorf to Meran.
What makes Christlessee unique: It never freezes - not even at minus 30 degrees.
Immediately south of it, strong springs arise that feed the lake with clear water and provide it with top drinking water quality. This means the lake never freezes over at any time of the year.