The lake, Eim, is still held sacred by the Esthonians, and the Eim-legend is thus told by F. Thiersch, quoted also by Grimm and by Mace da Charda:- https://www.sacred-texts.com/neu/kveng/kvintro.htm
"Savage, evil men dwelt by its borders. They neither mowed the meadows which it watered, nor...