|Easton's Bible Dictionary|
Multitude of Gog, the name of the valley in which the slaughtered forces of Gog are to be buried (Ezek. 39:11, 15), "the valley of the passengers on the east of the sea."
Int. Standard Bible Encyclopedia
ha'-mon-gog (hamon-gogh, "the multitude of Gog"): The name of the place where "Gog and all his multitude" are to be buried (Ezekiel 39:11, 15). By a change in the pointing of Ezekiel 39:11, ha-`abharim for ha-`obherim, we should read "valley of Abarim" for "valley of them that pass through." In that case it would seem that the prophet thought of some ravine in the mountains East of the Dead Sea.
Hamon-gog (2 Occurrences)
Ezekiel 39:11 And it shall come to pass in that day, that I will give unto Gog a place for burial in Israel, the valley of them that pass through on the east of the sea; and it shall stop them that pass through: and there shall they bury Gog and all his multitude; and they shall call it The valley of Hamon-gog. (ASV BBE DBY JPS WBS NAS RSV)
Ezekiel 39:15 And they that pass through the land shall pass through; and when any seeth a man's bone, then shall he set up a sign by it, till the buriers have buried it in the valley of Hamon-gog. (ASV BBE DBY JPS WBS NAS RSV)