On occasion of the formation of the Alps, the fossilized sediments material of the body of water between the Ricken and Etzel chains unfolded.

There arose the typical rock bands that form the Lindenhof hill in Rapperswil, or the islands of Ufnau, Lützelau and Heilighüsli.

Historians mention a 10th-century ferry station assumably at the so-called Einsiedlerhaus in Rapperswil – in 981 AD as well as the vineyard on the Lindenhof hill – between Kempraten on lake shore, Lützelau and Ufenau island and assumably present Hurden, which allowed the pilgrims towards Einsiedeln to cross the lake before the prehistoric bridge at the Seedamm isthmus was re-built in 1358.

On 12 May 1433 Heini Murer von Grueningen and his wife Anna Keller confirmed the transfer of their lands on Lutzelnoew for 100 Pfund Pfennig Zürcher Währung to the Abbot Johans and the convent of the Rüti Abbey, including buildings and lands in the Herrschaft Grüningen, and to be enrolled in the abbey's libri anniversariorum (German: Jahrzeitbuch).

[5] Swimming, camping and other leisure activities are permitted on Lützelau campsite, but forbidden on Ufnau, as well within the Frauenwinkel lake area.