Ver. 20. And those twelve stones—did Joshua pitch in Gilgal— Josephus relates the matter as if the Israelites had reared these stones in the form of an altar. It is more probable, that, in order to represent the number of the tribes, they were pitched each upon its basis, as so many small pillars, perhaps in three lines, and probably on an elevation.
Related Commentaries of Joshua 4:20
Joshua 4:20
20 And those twelve stones, which they took out of Jordan, did Joshua pitch in Gilgal.