Due to its location below the Zugspitze and the clear, green-tinted water, the lake is considered one of the most beautiful lakes in the Bavarian Alps. It was formed when the Isar Loisach glacier withdrew at the end of the Würm glaciation and left a depression that filled with water. Between 1700 BCE and 1400 BCE, a landslide with an area of 13 square kilometers and a volume of 350 million cubic meters crossed the central and eastern part of the lake. The estimated energy released during this landslide event with an average fall height of 1400 meters corresponds to approximately 2.9 megatons of TNT (approximately 220 Hiroshima bombs).