The Tohono O’odham Nation is a federally-recognized tribe that includes approximately 28,000 members occupying tribal lands in Southwestern Arizona. The Nation is the second largest reservation in Arizona in both population and geographical size, with a land base of 2.8 million acres and 4,460 square miles, approximately the size of the State of Connecticut. Its four non-contiguous segments total more than 2.8 million acres at an elevation of 2,674 feet.