Badwater Basin, Death Valley, lowest point in North America, at -282 feet (-86m).  Mt. Whitney, 135 miles (217km) away, is the tallest point, at 14,505 (4421m) feet elevation, in the contiguous 48 US states. Mt. McKinley, aka Denali in Alaska, is 20,308 feet (6,190m).<br />
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The Dead Sea (Jordan/Israel) is the lowest point on Earth at -1360 feet (-414 m) below sea level.