Wahyu 9:2-21

Abadon : the king (or messenger) of the abyss

Apolion : the King of the Abyss

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´)