An ancient desert wall in northern Peru was built to protect precious farmlands and canals from the ravages of El Niño floods, according to new research.
Many archaeologists had suggested that the wall, known as the Muralla La Cumbre and located near Trujillo, was built by the Chimú people to protect their lands from invasions by the Incas, with whom they had a long-standing enmity. But the latest research affirms a theory that the earthen wall, which stretches 6 miles (10 kilometers) across the desert, was built to hold back devastating floods during the wettest phases of northern Peru's weather cycle.
