Added Information on the Biblical Garden of Eden
by Lawrence Hebb
(Hamilton, New Zealand)
Since writing the article I've uncovered some more interesting stuff that indicates the Southern location as the possible source.
First of all the Persian gulf is only under water by 35 metres. Geologists tell us that it flooded sometime between 10,000 BC and 5,000 BC. This was because before that there was a kind of ICE age where glaciers covered much of Europe. The Mediteranean sea was above sea level and there was a Land bridge linking Europe to the British Isles.
The Tigris and Euphrates rivers flowed in much the same path as they do today, with the difference that it was much longer. Also there's a river called the Kihon in Iran that enters the gulf at the Northern end and saellite photos from NASA show a dried up river bed that flows into the gulf. At the head of the river bed are known silica deposits and semi precious stones that the Bible tells us about.
All this points to the Biblical Garden of Eden being just under the Persian gulf.