Deem Hills is comprised of almost 1,000 acres of Sonoran Desert and is known for it's unique basalt volcanic rock formations. The 5.7 mile Deem Hills Circumference trail traverses the entire recreation area and commands excellent views of the Phoenix area. The Ridgeline trail runs 1.5 miles and is the highest trail in elevation in the system. Several shorter trails provide a wide range of both distance and difficulty from this location.