Encircled by seven mountain ranges in the Altar Valley, remote Buenos Aires National Wildlife Refuge is the only place in the United States where the Sonoran-savanna grasslands that once pervaded this region can still be seen. The U.S. Fish and Wildlife Service oversees this 115,000-acre preserve, managing programs to restore native grasses and protect endangered species such as the masked bobwhite quail. Birding and wildlife-viewing are popular here.
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