Arabah in the Bible

Then Abner and his men went through the Arabah all that night, and they crossed over the Jordan. They went all the forenoon and came to Mahanaim.

When they had come [into] the house, he [was] lying on his couch {in his bedchamber}, and they attacked him and killed him. Then they {beheaded him}, and they took his head and went on the way of the Arabah all night.