The term 'Sudan's ___ Desert' is referring to the Nubian Desert, which is located in the northeastern part of Sudan. It is a large desert that covers an area of over 300, 000 square kilometers and is one of the most arid regions in the world. The Nubian Desert is home to a variety of wildlife, including gazelles, hyenas, and jackals. It is also known for its sand dunes, which can reach heights of up to 200 meters.