A retaining wall comprised of big boulders. These stones support the left bank of the valley. This valley is named officially nachal Raba, but more correctly it should be named wadi Raba. This valley is located in the town Rosh-ha-Ayin, near Petah-Tikva. This wall is a part of an urban project to stabilize the banks of this wadi, performed by the municipality of Rosh-ha-Ayin.