I know you've probably done this one and of for decades but it's funny because of how easy things can be now. Like now if you just do a google image search for '4 rivers of eden' you pretty much either get the right answer or something very close to what it probably was.

I tend to think Eden was either the land that is under the Red Sea or the land that is under the Persian Gulf as either could have been significantly inundated after the last glacial maximum when sea levels rose.

Like if Eden was under the Red Sea, the land beyond the little choke point called the Bab al-Mandab Strait there is even still called the Gulf of Aden and there's a little port town nearby called Aden on the Southern coast of Yemen. And there's clearly a long central channel/valley/river valley through the middle of the Red Sea itself.

One of the rivers is even called "Phirat" aka phrt which seems likely to be the phrates part of the name Euphrates. The other rivers...even the Euphrates, it's hard to say exactly where they would have been in the past. It depends on exactly when you mean to look for them. Rivers can move around quite a bit over the years as a river cuts its own pathway, and the climate changes over time. In general there were a lot of rivers when the glaciers were all melting.