The Sacred Lake is the largest of its kind and was dug by Tuthmosis III (1473-1458 BCE). It measures 120 m by 77 m and is lined with stone wall and has stairways descending into the water. The lake was used by the priests for ritual washing and ritual navigation. It was also home to the sacred geese of Amun (the goose being another symbol of Amun) and was a symbol of the primeval waters from which life arose in the ancient Egyptian’s idea of creation.