Tucked away in rugged and scenic country southwest of the community of San Ysidro, New Mexico, is the White Ridge Bike Trails area. This site is a short distance from U.S. 550, and the region is known for its geological, cultural and paleontological resources, as well as for its scenic qualities. The bike trail crosses a landscape of spectacular beauty and exceptional geology, meandering through the Pueblo of Zia, State of New Mexico, and public land managed by the Bureau of Land Management (BLM). BLM has obtained rights-of-way from the Pueblo and the State to provide this biking experience. Although the Trails have been developed primarily for mountain biking, hikers are welcome on the entire trail system, and one segment is also open to equestrian use. White Ridge is named for the color of the gypsum that forms much of the mesa and the majority of the bike trails. Gypsum is a white mineral consisting of hydrated calcium sulfate and is commonly used in cement, plaster and fertilizer. This gypsum formed as a chemical reaction from evaporation of an ancient water body. The White Ridge Bike Trails are open year-round.