Location Of The Garden Of Eden

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If we are to believe that Genesis was just a moral story then why describe locations of places at all? It does not make sense, once again to think of the Bible as being allegorical when specific descriptions are given.

It is an account passed down to Moses through several generations. 

No, you cannot conclude it's either moral allegory or sets out to describe locations which outsiders can find on a world map, which they didn't have in Biblical days. 

Moses could be describing a garden the size of a city park with a spring in it which fed into the Euphrates via four routes.  The spring and the routes could be so small that they would only have been known to locals.  They could be long gone or they could be re-routed long ago.