hiddekel

from Easton's 1897 Bible Dictionary
Hiddekel
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.
    

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