The meaning of Arabah in the Bible
(From Easton's Bible Dictionary)

plain, in the Revised Version of II Kings 14:25; Joshua 3:16; 8:14; 2Sam 2:29; 4:7 (in all these passages the A.V. has "plain"); Amos 6:14 (A.V. "wilderness"). This word is found in the Authorized Version only in Joshua 18:18. It denotes the hollow depression through which the Jordan flows from the Lake of Galilee to the Dead Sea. It is now called by the Arabs el-Ghor. But the Ghor is sometimes spoken of as extending 10 miles south of the Dead Sea, and thence to the Gulf of Akabah on the Red Sea is called the Wady el-Arabah.

See more on the meaning of Arabah in the Bible:
Arabah {International Standard Bible Encyclopedia}

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