UNESCO has published a map of trans-boundary aquifers which highlights the potential for international conflict. 273 trans-boundary aquifers have been identified: 68 in the Americas, 38 in Africa, 155 in Europe and 12 in Asia. Currently, international legal regimes such as treaties or regional agreements largely govern surface waters.
Here's an article about the map from New Scientist:
http://www.newscientist.com/article/dn15030
There's a link to the map on this page.
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