Easton's Bible Dictionary (1897)
Foundation, a place in the open desert wastes on the east of Jordan (Judg. 8:10), not far beyond Succoth and Penuel, to the south. Here Gideon overtook and routed a fugitive band of Midianites under Zeba and Zalmunna, whom he took captive.
Smith's Bible Dictionary (1863)
(foundation), the place in which Zebah and Zalmunna were again routed by Gideon, (Judges 8:10) must have been on the east of Jordan.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
KAR'KOR (foundation), the scene of Gideon's final dispersion of the defeated hosts of Zebah and Zalmunna. Jud 8:10.
Hitchcock's Bible Names (1869)
they rested