The “valley of Zephathah” - not elsewhere mentioned - is probably the broad Wady which opens out from Mareshah (marginal reference) in a northwesterly direction, leading into the great Philistine plain. Zerah, on the advance of Asa, drew off into the wider space of the Wady, where he could use his horsemen and chariots.
Related Commentaries of 2 Chronicles 14:10
2 Chronicles 14:10
10 Then Asa went out against him, and they set the battle in array in the valley of Zephathah at Mareshah.