Wahyu 16:1-16

Efrat : a large river which joins the Tigris river before flowing into the Persian Gulf,a river flowing from eastern Turkey to the Persian Gulf
(30° 39´, 34° 50´); (35° 5´, 40° 25´); (31° 42´, 35° 12´)

Harmagedon : a large plain overlooked on the south west by the Carmel Mountain Range which has the town of Megiddo in its foot hills.
(32° 35´, 35° 10´)