Around 9600 BCE, year-round habitation began at Jericho near the Ein es-Sultan spring as the Younger Dryas period ended. By 9400 BCE, the Pre-Pottery Neolithic settlement contained over 70 circular clay and straw brick dwellings housing an estimated 1,000-3,000 people. By 8000 BCE, inhabitants constructed a stone wall approximately 3.6 meters high and 1.8 meters wide, with an 8.5-meter internal tower. The community cultivated wheat and barley while developing irrigation techniques. This transition from nomadic to settled agrarian life preceded urban centers that later emerged in Mesopotamia.