d) Chihuahuan Desert

Big Bend National Park in Texas is home to the unique Chihuahuan Desert biosphere reserve. This desert, one of the largest and most biologically diverse in North America, is characterized by its varied topography and climate, which supports a wide array of plant and animal life. The park encompasses river, desert, and mountain environments, offering a rare glimpse into the complex ecosystem of a large desert area. The Chihuahuan Desert in Big Bend is known for its scenic beauty, geological features, and rich biodiversity, making it a fascinating destination for nature enthusiasts and scientists alike.