Located just off of I-80 in Utah’s west desert is the Knolls Recreation Area. With nearly 36,000 acres of sand dunes, hills, and mud flats, this place is the perfect OHV play area. The dunes are not as large as Jericho but just as fun. If your looking for speed the mud flats are the place, you can drive long distances on these flats and rarely feel a bump.(*)