'Ravine' in the Bible

From Aroer, which is on the bank of the river Arnon, and the city that is in the ravine even to Gilead, there was not one city too strong for us: Jehovah our God delivered all before us.

And to the Reubenites and to the Gadites I gave from Gilead even to the river Arnon, the middle of the ravine and its border, as far as the river Jabbok, the border of the children of Ammon;