The trail to Lake Grünau leaves Sulzenauhütte in an easterly direction over the glacial river via a Bridge leading to Übergschritt. Then follows a 50m ascent into the basin of the Freiger glacier (Seitenmoränen, Stirnmoränen). Further still, we cross over the Grünau river to Seitenmoräne until reaching Grünausee (free translated: ‘Green Lake’). The lake lies beautifully embedded in the green meadow. The crystal clear colour of the lake is breath-taking. A rewarding hike along one of the most beautiful parts of the High Trail.