The Rio Grande Joint Venture includes the Chihuahuan Desert Bird Conservation Region [BCR] (red) in Texas and Mexico, and all of the Tamaulipan Brushlands BCR (blue). A small sliver of the Gulf Coastal Plain BCR (green) in Mexico is included in the JV.
The Rio Grande Joint Venture overlaps with the Gulf Coast Joint Venture in an area of south Texas. This overlap area is indicated with diagonal stripes.
Thanks to Mark Parr of the Gulf Coast Joint Venture for producing this map!