Albert Barnes Commentary 2 Chronicles 20:26

"And on the fourth day they assembled themselves in the valley of Beracah; for there they blessed Jehovah: therefore the name of that place was called The valley of Beracah unto this day." — 2 Chronicles 20:26 (ASV)

The valley of Berachah - This is probably the Wady Bereikut, which lies a short distance northwest of Tekoa.