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Transboundary Waters

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A transboundary waterway is defined as all territory which contributes to a stream, at least one of the tributaries of which crosses a boundary. Almost half the Earth's land surface (excluding Antarctica) and 60%of the world's fresh water falls within transboundary basins.

Transboundary water management is a very extensive topic, impossible to summarize in one article.
To begin with, the following sections will show transboundary river basins and relevant transboundary water management organizations.

Africa

Africa offers the most extreme case of transnational waters. Every continental African state has territory on at least one transnational river basin, and such basins cover 62% of Africa’s total land area. Depending on how they are defined, there are more than 60 transnational rivers and large lakes (these figures exclude shared groundwater aquifers, which are even more challenging than surface water). Nearly half of these are shared by three or more countries and the ten largest basins are shared by four or more countries. Fifteen countries have five or more shared basins within their national borders.

International river basins

Africa.jpg

Details available here: http://www.transboundarywaters.orst.edu/publications/register/tables/IRB_africa.html 

Transboundary aquifers

Africaaquifers.png

Details available here: http://www.isarm.net/dynamics/modules/SFIL0100/view.php?fil_Id=254

River basin organizations

Asia

International river basins

Asia.jpg

Details available here: http://www.transboundarywaters.orst.edu/publications/register/tables/IRB_asia.html

Transboundary aquifers

AsiaAquifers.png

Details available here: http://www.isarm.net/dynamics/modules/SFIL0100/view.php?fil_Id=255 

River basin organizations

South America

southamerica.jpg

River basin organizations

Europe

Europe.jpg

River basin organizations

References

International River Basin Registry 

International Water Law Project

ISARM Atlas of Transboundary Aquifers

An information resource and hub for the global water community
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