(Click to enlarge map area)
Region 3 encompasses the upper Yaqui basin along the Arizona-Sonora border.
United States Department of the Interior U.S.-Mexico Border Field Coordinating Committee, United States-Mexico Border Area, As Delineated by a Shared-Water Resource Perspective cited as U.S. Department of the Interior Field Coordinating Committee Fact Sheet 1, February 1996.
Excerpt at page 3:
SHARED WATER RESOURCES ISSUES TEAM
This map of the United States-Mexico border area, as delineated by a shared-water resources perspective, is the first product of a multi-bureau “issues team” operating under the United States Department of the Interior (DOI) sponsored U.S.-Mexico Border Field Coordinating Committee (FCC). The seven DOI Bureaus are participating in the FCC through collaboration and coordination to develop a strong border program, and hence to develop a comprehensive understanding of factors necessary to conserve and protect the shared natural and cultural resources.
The U.S.-Mexico border area exists, in general, in an arid climate with limited water resources. In spite of this, and to a large extent accelerated by NAFTA, the border area continues to develop at a very rapid rate. Water managers face many difficult and unique water-resources issues and challenges. The Shared-Water Resources Issues Team is tasked with defining the basic hydrologic and geologic information, data deficiences, major issues, and potential directions that future efforts should take in order to provide the necessary data and information frameworks upon which critical decisions can be made and actions evaluated.