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Inyo County, California, United States of America (36.55953 -117.40747)
Mount Whitney, the highest peak in the contiguous United States, is on Inyo County's western border (with Tulare County). The Badwater Basin in Death Valley National Park, the lowest place in North America, is in eastern Inyo County. The difference between the two points is about 14,700 feet (4,500 m). They are not visible from each other, but both can be observed from the Panamint Range on the west side of Death Valley, above the Panamint Valley. Thus, Inyo County has the greatest elevation difference among all of the counties and county-equivalents in the contiguous United States.
Palm Desert, Fresco Lane, Palm Desert, Riverside County, California, United States of America (33.74080 -116.36937)
Coordinates: 33.67067 -116.42551 33.81008 -116.30205 - Minimum elevation: 9 m - Maximum elevation: 1,139 m - Average elevation: 145 m
Madeira Park, Portola Glen, Ulmar, Livermore, Alameda County, California, United States of America (37.68482 -121.76067)
Coordinates: 37.68453 -121.76105 37.68499 -121.76053 - Minimum elevation: 119 m - Maximum elevation: 270 m - Average elevation: 160 m