The meaning of Hiddekel in the Bible
(From Easton's Bible Dictionary)

called by the Accadians id Idikla; i.e., "the river of Idikla", the third of the four rivers of Paradise (Genesis 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.

See more on the meaning of Hiddekel in the Bible:
Hiddekel {International Standard Bible Encyclopedia}

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