When they told it to Jotham, he went and stood on the top of Mount Gerizim, and lifted up his voice, and cried, and said to them, Listen to me, you men of Shechem, that God may listen to you.
"The top of mount Gerizim"  (Judges 9:7).  This was not the summit, but that pulpit-like projection from Gerizim overlooking the acoustically perfect valley, where, in all probability, some kind of a public festival was being conducted.  From such an eminence, Jotham was able to make himself heard by a great multitude.