Kitto's Popular Cyclopedia of Biblial Literature
Sin, a city of Egypt, which is mentioned in , in connection with Thebes and Memphis, and is described as 'the strength of Egypt,' showing it to have been a fortified place. The Sept. makes it to have been Saïs, but Jerome regards it as Pelusium. This latter identification has been generally adopted, and is scarcely open to dispute. Pelusium was anciently a place of great consequence. It was strongly fortified, being the bulwark of the Egyptian frontier on the eastern side, and was considered the 'key,' or, as the prophet terms it, 'the strength' of Egypt. It was near this place that Pompey met his death, being murdered by order of Ptolemy, whose protection he had claimed. It lay among swamps and morasses on the most easterly estuary of the Nile (which received from it the name of Ostium Pelusiacum), and stood twenty stades from the Mediterranean. The site is now only approachable by boats during a high Nile, or by land when the summer sun has dried the mud left by the inundation: the remains consist merely of mounds and a few fallen columns. The climate is very unwholesome.
Sin, the desert which the Israelites entered on turning off from the Red Sea (;; ) [SINAI].
Kitto, John, ed. Entry for 'Sin'. "Kitto's Popular Cyclopedia of Biblial Literature". https://www.studylight.org/encyclopedias/eng/kbe/s/sin.html.