'Wadi' in the Bible

Then Saul came up to the city of Amalek and set an ambush in the wadi.

Then he took his staff in his hand, picked out for himself five smooth stones from the wadi, and he put them in his shepherd's bag, in the pouch. And with his sling in his hand, he approached the Philistine.

So David went, he and the six hundred men who were with him, and they came to the Wadi Besor, but the rest remained.

David pursued, he and four hundred men; but two hundred men stayed because they were too exhausted to pass over the Wadi Besor.

Then David came to [the] two hundred men {who had been too exhausted to follow} David; they had left them behind at the Wadi Besor. They went out to meet David and to meet the people who were with him. David came near with the people and {asked them how they were doing}.