Jericho is one of the oldest continuously inhabited cities in the world, located near the Jordan River in the West Bank. Archaeologists have found evidence of settlements in Jericho dating back to 10,000 BC, when Natufian hunter-gatherers would camp at the Ein es-Sultan spring. By about 9400 BCE, the site had grown to more than 70 modest dwellings surrounded by a massive stone wall and tower. Pre-Pottery Neolithic settlements followed, with inhabitants domesticating crops and hunting game. The second PPNB settlement established around 6800 BCE may have been founded by invading peoples who absorbed the original inhabitants.