The Mt. Eval altar is an archeological site on northeastern shoulder of the mountain. The site was first discovered on 6 April, 1980, during a systematic archeological survey by an expedition headed by Prof. Adam Zertal, who identified the altar as the one used by Joshua.

Potsherds that experts dated to the Israelite period (12th century BCE) were found scattered all around the pile of stones and the entire site. The site was identified as having only one chronological layer and the way it is positioned is different than other sites from this period. Entrance to the site requires coordination with the IDF.