A lost branch of the Nile River, known as the ‘Ahramat’ (Arabic for ‘pyramid’), facilitated the construction of 31 ancient Egyptian pyramids, including the Great Pyramid of Giza. Researchers from the University of North Carolina Wilmington discovered the remains of the Ahramat branch, which was about 40 miles (64 kilometers) long and extended close to the pyramid sites. The branch was active during the construction phase of the pyramids, as evidenced by causeways leading to its riverbank and valley temples that may have functioned as river harbors. The Ahramat branch shifted eastward over time, from the west during the Old Kingdom (circa 2649 to 2150 B.C.) to the east during the Middle Kingdom (circa 2030 to 1640 B.C.). Eventually, the branch dried up due to intensified drought conditions in the region. This discovery highlights the importance of the Nile River system in supporting the construction of the pyramids, as it provided a convenient and efficient means of transporting materials to the construction sites. It also underscores the engineering prowess of the ancient Egyptians, who utilized the natural environment to facilitate their architectural achievements.