In Genesis 2:10-14, The exact passage is given of the physical boundaries of the Garden location: Eastward of Eden. The names of the four rivers are noted: Pishon, Gihon (blue & white Nile), Hiddekel (Tigris) and the Euphrates. The Nile is the longest river system in the world. The early civilization was born along the banks of this river in Eqypt. The Tigris river is at AZ Qurnak, Iraq about 120 miles from the Persian Gulf. The Euphrates rises in the mountains of Turkey and runs southeast through the great plains of Syria in Iraq. Early scholars & historians have erroneously called the Mesopotamian basin the "Cradle of Civilization" It is also referred to as the "Fertile Crescent". Most contemporary maps of Africa show only the main body of continent with Suez Canal being its northern border. However, prior to the building of the Suez Canal (1859-1869). Africa perhaps extended to the Tigris and Euphrates Rivers. During that time this Region was landlocked with the main continent. Ancient caravans once sojourn these regions by foot (Gen 46:)
Also biblical historical accounting denotes that the original people who inhabited the land of this region were of Ebony Hue-black Africans and the mix stock of Afro-Asiatics. Hence the origin of mankind.
Even today, contemporary scholars verify that the "First People" of the Earth were of African descent. Scientific evidence has recently revealed that the earliest findings indicate that Eve lived in Sub-Saharan Africa.
The great legendary Anthropologist/Paleologist-Louis S.B. Leaky point some of this out in his early discoveries of fossil remains of man found in Eastern Africa.