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Montgomery County, Maryland, United States of America (39.14063 -77.20756)
According to the U.S. Census Bureau, the county has a total area of 507 square miles (1,310 km2), of which 491 square miles (1,270 km2) is land and 16 square miles (41 km2) (3.1%) is water. Montgomery County lies entirely inside the Piedmont plateau. The topography is generally rolling. Elevations range from a low of near sea level along the Potomac River to about 875 feet in the northernmost portion of the county north of Damascus. Relief between valley bottoms and hilltops is several hundred feet.
Williston Lake, Williston Road, Williams Heights, Williston, Caroline County, Maryland, 21629, United States of America (38.82706 -75.84379)
Coordinates: 38.82441 -75.84643 38.82967 -75.83229 - Minimum elevation: -1 m - Maximum elevation: 30 m - Average elevation: 13 m
Auth Village, Camp Springs, Prince George's County, Maryland, 20746, United States of America (38.82095 -76.90220)
Coordinates: 38.80095 -76.92220 38.84095 -76.88220 - Minimum elevation: 39 m - Maximum elevation: 119 m - Average elevation: 78 m
Centennial Lake, Lakeside Court, Dorsey's Search, Ellicott City, Howard County, Maryland, 21042, United States of America (39.24259 -76.85607)
Coordinates: 39.24005 -76.86830 39.24512 -76.85216 - Minimum elevation: 93 m - Maximum elevation: 167 m - Average elevation: 126 m