And if we know where the Israelites crossed the Red Sea.....that puts Mount Sinai in close relation to that crossing point.
The real Mount Sinai - The Mountain of God - is in modern day Saudi Arabia. The Real Mount Sinai is Jabal-El-Lawz in Western Saudi Arabia, near the "back of the desert". This would also be the place where Jethro and his clan were living when Moses escaped out of Egypt.
Saudi Arabian authorities have even put up a large fence and guard station to preserve the site.
The Apostle Paul states the location of Mount Sinai as well: (Galatians 4:5) "Mount Sinai in Arabia"