The Rayyan Valley lies about 20 km west of El Fayyoum, a fertile depression south west of Cairo, Egypt. It is visible from any airplane passing over the area, where the two lakes (see below) are clear. It is a spectacular view to see the Fayyoum oasis, surrounded by desert and barren mountains from all sides, Lake Qarun from the North West, and the life-giving Bahr Youssef (a tributary from the Nile River).
Below are some pictures. Here is another link to Rayyan Valley photos by an Egyptian Canadian.