North America's lowest and highest points sit just 85 miles apart

Badwater Basin in Death Valley sits 282 feet below sea level, the lowest point in North America. Mount Whitney, the highest peak in the contiguous United States at 14,505 feet, is only about 85 miles away as the crow flies, on a clear day you can see it from the salt flats.

— Wikipedia contributors, Badwater Basin — Wikipedia, Death Valley National Park entry