The United States-Mexico Affairs Office (MEAF) was established June 1991 to represent the interests of the National Park Service on U.S.-Mexico border conservation issues.  It is the only office within the Department of the Interior dedicated to working with Mexico on trans-border natural and cultural resource management issues. MEAF is located at New Mexico State University (NMSU) in Las Cruces, NM within the Southwest Cluster of the Intermountain Region.

    The National Park Service manages approximately eighteen percent of the land in the United States along the Mexican border.  The two largest park units located adjacent to the border are Big Bend National Park and Organ Pipe Cactus National Monument. 

    Key issues include general park natural and cultural resource management with the emphasis on cross border ties and cooperation involving shared resources.  Further activities are focused on water and air quality, fire suppression, management and ecology, resource management planning, and illegal immigration and trafficking impacts on park resources.