Recent archaeological discoveries in the Jordan Valley and the adjoining hills of Samaria appear to indicate that as Israel took possession of the land, they marked ownership of the land by building several structures that resemble a large foot print or sandal.
A massive foot-print can be found at Bedhat esh-Sha’ab, located in the Jordan Valley some two miles northwest of the Damiyeh Bridge across the River Jordan. It is thought by some that this site is the Gilgal where Israel initially encamped after crossing the Jordan and treading upon the land of promise for the first time.
Read more about this interesting discovery at: ICEJ (off-site link).