The Garden of Eden was very real, but the Flood destroyed the antediluvian world. Totally. It is buried, all of it, under miles of sediments and strata. Since then the one continent that it was has divided into the seven continents we have today plus a lot of islands! The world is entirely different.
So where Eden was is not possible to discern.
On the other hand, those events that happened since can basically be placed geographically. Usually! There are enormous fights, as you may know, about the location of various events the Bible talks about.
But the precise locations themselves are not nearly as important as the fact that these events happened. Abraham was real and those things the Bible speaks of really happened. Ditto Noah, David, Solomon, Isaiah, and all the rest. In the New Testament, Jesus, the core of the entire Bible, is definitely for real, as is His crucifixion and resurrection. Paul and the Apostles are for real, as are the events in Acts.
Just because we don't know the precise longitude and latitude of some of the events does not take away from their reality.