Creationist ViewJewish, Christian and Muslim creationists believe that man was created by God in a place called Eden and then placed in a garden located east of Eden. In the Christian Bible, Genesis 2:10-14 indicates the Garden of Eden was supplied by the Tigris and Euphrates rivers. Some early Christians (A.D second century) used the term to refer to a geographic area falling within a 1,000 mile radius of that location as the birthplace of mankind.
Based on the second century 1,000-mile "limit", the fifteen nations/territories that today comprise the "Cradle of Humanity" are, in alphabetical order: Bahrain, The Gaza Strip, Iran, Iraq, Israel, Jordan, Kuwait, Lebanon, Oman, Qatar, Saudi Arabia, Syria, United Arab Emirates, the Palestinian territories, and Yemen.
The radius of 1,000 miles from Eden as the limit of the Cradle of Humanity may have been "fixed" by the Christian authors of Mesopotamia, Syria and Egypt in the pre-Islamic era.