Tribal Land Boundary Polygons, R6 and R9 U.S.-Mexico Border Region, 2021, U.S. Environmental Protection Agency
This polygon feature class contains the boundaries of tribes in the U.S. - Mexico Border region used by U.S. EPA Region 6 (R6) and U.S. EPA Region 9 (R9) for the Border 2020 Program. 

R6 tribal boundaries were acquired from the R6 GIS Office (based on the 2010 US Census Bureau TIGER/Line file) and the Ysleta del Sur …