Called by the Accadians id Idikla; i.e., “the river of Idikla”, the third of the four rivers of Paradise (Gen. 2:14). Gesenius interprets the word as meaning “the rapid Tigris.” The Tigris rises in the mountains of Armenia, 15 miles south of the source of the Euphrates, which, after pursuing a south-east course, it joins at Kurnah, about 50 miles above Bassorah. Its whole length is about 1,150 miles.
Hiddekel
2 verses
Genesis
Genesis 2:14
And the name of the third river is Hiddekel: that is it which goeth toward the east of Assyria. And the fourth river is Euphrates.
Daniel
Daniel 10:4
And in the four and twentieth day of the first month, as I was by the side of the great river, which is Hiddekel;
From Easton's Bible Dictionary
Matthew George Easton, 1897