As of October 26, 2008 a worldwide map of ground water resources crossing national boundaries has just been published by the United Nations Educational, Scientific, and Cultural Organization (UNESCO). This map details 273 shared aquifers across the globe. The map also indicates water quality of the aquifers, recharge of the aquifers, streams and rivers in the region of the aquifers, and population density near the aquifers. This project is very important because shared ground water resources could increase conflict across political boundaries in the future. The delineation of transboundary aquifers will assist countries in current and future water planning.
The site links to the various worldwide maps UNESCO has created however some are difficult to read and interpret.