Google Earth view of Mount Ebal and Mount Gerizim, looking east; Shechem is located in the valley between the two mountains, and the altar is on the slope of Mount Ebal to the north (far left in this view).
Aerial view of the altar complex on Mt Ebal, with an overlay highlighting the main structure. The extension on the left is interpreted as a ramp for accessing the top of the altar (cf. Ex. 20:26). The central part may have originally been filled with dirt, as directed in Exodus 20:24.