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Carlsbad Caverns National Park

(Encyclopedia) Carlsbad Caverns National Park, 46,766 acres (18,940 hectares), SE N.Mex., in the Guadalupe Mts.; designated a national park in 1930. These connecting limestone caves, with remarkable…

Poverty Point National Monument

(Encyclopedia) Poverty Point National Monument: see National Parks and Monuments (table)national parks and monuments (table).

Pipe Spring National Monument

(Encyclopedia) Pipe Spring National Monument: see National Parks and Monuments (table)national parks and monuments (table).

Rainbow Bridge National Monument

(Encyclopedia) Rainbow Bridge National Monument, 160 acres (65 hectares), S Utah; est. 1910. Rainbow Bridge, the largest natural bridge in the world, is a symmetrical, pink, sandstone arch, 309 ft (…

Richmond National Battlefield Park

(Encyclopedia) Richmond National Battlefield Park: see Richmond, Va.; National Parks and Monuments (table)national parks and monuments (table).

Riding Mountain National Park

(Encyclopedia) Riding Mountain National Park, 1,148 sq mi (2,973 sq km), SW Man., Canada, W of Lake Manitoba; est. 1929. A wooded region with small glacial lakes, on the highest part of the Manitoba…

Ozark National Scenic Riverways

(Encyclopedia) Ozark National Scenic Riverways, 80,786 acres (32,707 hectares), along the Current and Jacks Fork rivers, SE Mo.; authorized 1964 as the first national scenic river; est. 1972. Many…