Revelation 9

Abaddon : the king (or messenger) of the abyss

Apollyon : the King of the Abyss

Euphrates : a large river which joins the Tigris river before flowing into the Persian Gulf,a river flowing from eastern Turkey to the Persian Gulf
(31° 46´, 35° 14´); (35° 5´, 40° 25´); (33° 14´, 33° 28´)

Greek Language : the language used by the people of Greece
(31° 46´, 35° 14´); (31° 46´, 35° 14´)

Hebrew Language : an ancient Jewish language used in the Old Testament