Heb. nahar mitsraim, denotes in Genesis 15:18 the Nile, or its eastern branch ( 2 Chronicles 9:26 ).

In Numbers 34:5 (RSV, "brook of Egypt") the Hebrew word is nahal , denoting a stream flowing rapidly in winter, or in the rainy season. This is a desert stream on the borders of Egypt. It is now called the Wady el-'Arish. The present boundary between Egypt and Palestine is about midway between this wady and Gaza. (See Numbers 34:5 ; Joshua 15:4 Joshua 15:47 ; 1 Kings 8:65 ; 2 Kings 24:7 ; Isaiah 27:12 ; Ezekiel 47:19 . In all these passages the RSV has "brook" and the A.V. "river.")

These dictionary topics are from
M.G. Easton M.A., D.D., Illustrated Bible Dictionary, Third Edition,
published by Thomas Nelson, 1897. Public Domain, copy freely.