Jamieson, Fausset and Brown on Ezekiel 39:11

11. place ... of graves--Gog found only a grave where he had expected the spoils of conquest.

valley--So vast were to be the masses that nothing but a deep valley would suffice for their corpses.

the passengers on the east of the sea--those travelling on the high road, east of the Dead Sea, from Syria to Petra and Egypt. The publicity of the road would cause many to observe God's judgments, as the stench (as English Version translates) or the multitude of graves (as Henderson translates, "it shall stop the passengers") would arrest the attention of passers-by. Their grave would be close to that of their ancient prototypes, Sodom and Gomorrah in the Dead Sea, both alike being signal instances of God's judgments.