15. Sin. Sin. No Egyptian city of this name is known, but it may be the same as Pelusium, or was probably in the vicinity of that town. Pelusium was a frontier town, strongly fortified and considered rightly as the key to Egypt, and hence called in the text its “strength.” Many important battles were fought there. It was also close to the sea, and is believed to be Tell ei-Farạ, 14 (22.4 ) east of the Suez Canal.