Yadda yadda yadda, they cross. What? You wanted more than that? You’ll have to read the book.
I’ve placed Pi-Hahiroth on the beach of the western side of the Straits of Tiran (around modern day Adrenaline Beach Park). This puts the end point of the crossing somewhere in the most western bit of northern Saudi Arabia.
The journey from Pi-Hahiroth to the other side is about 12 miles (19.3 kilometers). Tempting as it would be to cross only to Titan Island, it’s an actual island and wouldn’t get them anywhere. So they must pass it by and go to the mainland of the Saudi Peninsula. This gives them a relatively shallow path on the seabed.
I am using basically the same path as Christian writer Steven Rudd (a researcher with whom I have profound differences, but I respect his Exodus geographical conclusions). He puts the trip at 16 km (about 10 miles), but close enough.
This brings us to the Wilderness of Shur, a location we can only guess at. Those who put the Red Sea crossing in the Gulf of Suez (or other bodies of water in that area) will of course put Shur in the Sinai Peninsula. But if you put, as I do, the Red Sea crossing in the Gulf of Aquba, then Shur must be in the Arabian Peninsula.