Answer:

A river watering the garden flowed from Eden; from there it was separated into four headwaters. The name of the first is Pishon. . . . The name of the second river is the Gihon. . . . The name of the third river is the Tigris . . . . And the fourth river is the Euphrates. (GENESIS 2:10–14).

GENESIS 7:18-23

Joy, we have absolutely no idea where the Garden of Eden was located. The Bible verse tells us about the Garden of Eden and it even mentions four rivers around the Garden. But there are only two rivers today that have the same names as those where the Garden of Eden was located, the Tigris and the Euphrates; the rest of the description doesn’t match. So the Garden of Eden wasn’t there. 

Also, the worldwide flood of Noah’s day would have destroyed everything on the earth, including the Garden of Eden. So why do those two rivers have the same names? Well, I think Noah, or someone in his family, named the rivers. And he used names of rivers that existed before the Flood — names he already knew. Maybe he wanted to be sure that the people would not forget the days before the Flood, and to remind them they must honor and obey God.

Source: https://answersingenesis.org/kids/bible-questions/where-is-the-garden-of-eden/