National monument, south-central Colorado, U.S. At the eastern edge of the San Luis Valley, it parallels for about 10 mi (16 km) the western base of the Sangre de Cristo Range. Established in 1932, the 60-sq-mi (155-sq-km) region contains some of the highest inland sand dunes in the U.S., with changing crests that rise to 700 ft (215 m)
State park and national lakeshore, southern shore of Lake Michigan, northern Indiana, U.S. The state park (founded 1925) comprises 2,182 acres (883 hectares) of shoreline, marshland, dunes, and forests. At the Big Blowout in the eastern end of the park, lake winds drift sands over a wooded area, creating a "graveyard of trees"; the dunes may reach heights of 200 ft (60 m). The national lakeshore (founded 1966) encloses the state park on three sides. Now covering more than 12,857 acres (5,205 hectares), it includes beaches and wooded ravines
(1) Accumulations of windblown SAND on the BACKSHORE, usually in the form of small hills or ridges, stabilized by vegetation or control structures (2) A type of bed form indicating significant SEDIMENT transport over a sandy seabed