In ancient Egyptian mythology, Aaru (/ɑːˈruː/; Ancient Egyptian: jꜣrw "Reeds, rushes"), known also as sḫt-jꜣrw or the Field of Reeds, is the heavenly paradise where Osiris rules. It has been described as the ka (a part of the soul) of the Nile Delta.
The ancient Egyptians believed that the soul resides in the heart and so, upon death, the Weighing of the Heart occurred. Each human heart is weighed on a giant scale against an ostrich feather, which represents the concept of Maat. Those souls which balance the scales are allowed to start a long and perilous journey to the Field of Reeds, where they will exist in pleasure for all eternity. Hearts heavy with evil tip and fall into the crocodilian jaws of the demon Ammit. After this "second death", the soul is doomed to restlessness in Duat.