Geographical Highs, Lows, and Boundaries of the U.S.
| Highest point: Mt. McKinley, Alaska | 20,320 ft. (6,198 m) |
| Lowest point: Death Valley, Calif. | 282 ft. (86 m) below sea level |
| Approximate mean elevation | 2,500 ft. (763 m) |
| Points farthest apart (50 states): Log Point, Elliot Key, Fla., and Kure Island, Hawaii | 5,859 mi. (9,429 km) |
| Geographic center (50 states): in Butte County, S.D. (west of Castle Rock) | 44°58'N lat.103°46'W long. |
| Geographic center (48 conterminous states): In Smith County, Kan. (near Lebanon) | 39°50'N lat. 98°35'W long. |
| Boundaries: | |
| Between Alaska and Canada | 1,538 mi. (2,475 km) |
| Between the 48 conterminous states and Canada (incl. Great Lakes) | 3,987 mi. (6,416 km) |
| Between the United States and Mexico | 1,933 mi. (3,111 km) |
Source: U.S. Geological Survey.
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