Bring your dune buggies, quid runners, motorcycles and camels to some of the best sand dunes in the US. The elevation at Dumont dunes ranges from about 700 feet at the river crossing to 1200 feet on the top of Comp Hill. There is approx 8,150 acres of open area. From one end to the other Dumont is about 3-4 miles long and about 1.3 miles wide. The types of dunes range from small rollers to large razorbacks and bowls.