In the western desert of Egypt, about 50 miles west of the Dakhla oasis, is Djedefre’s Water Mountain, a small butte-like structure with hieroglyphs speaking of Djedefre (a son of Cheops) and his fields nearby which were watered by artesian flows from the surrounding high ground, where pigments were mined to paint the edifices of Old Kingdom Egypt, and interestingly Sa Wadjet is recorded to have overseen that operation, one of the last to have used that territory (now harsh desert) before the Ice Age ended.
