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The term "United States," when used in the geographical sense, refers to the contiguous United States (sometimes referred to as the Lower 48, including the District of Columbia not as a state), Alaska, Hawaii, the five insular territories of Puerto Rico, Northern Mariana Islands, U.S. Virgin Islands, Guam, American Samoa, and minor outlying possessions. [1]
Kingman Reef high point – less than 7 feet (2 m) [92] Midway Atoll, Sand Island high point – 50 feet (15 m) [92] – The highest point of the U.S. minor outlying islands in the Pacific Ocean. Navassa Island high point – 280 feet (85 m) [91] – The highest point of all the U.S. minor outlying islands.
Of the 200 most prominent summits of the United States, 84 are located in Alaska, 17 in California, 17 in Nevada, 14 in Washington, 12 in Montana, 11 in Utah, nine in Arizona, seven in Hawaii, six in Colorado, six in Oregon, four in Wyoming, four in Idaho, four in New Mexico, two in North Carolina, and one each in New Hampshire, New York, Tennessee, Texas and Maine.
The National Map is a collaborative effort of the United States Geological Survey (USGS) and other federal, state, and local agencies to improve and deliver topographic information for the United States. [1] The purpose of the effort is to provide "...a seamless, continuously maintained set of public domain geographic base information that will ...
The topographic elevation of a summit measures the height of the tip of a mountain above a geodetic sea level. [b] [c] The first table below ranks the 100 highest major summits of the United States by elevation. The topographic prominence of a summit is a measure of how high the summit rises above its surroundings.
The topographic prominence of a summit is a measure of how high the summit rises above its surroundings. [4] [3] The topographic isolation (or radius of dominance) of a summit measures how far the summit lies from its nearest point of equal elevation. [5] In the United States, only Denali exceeds 6000 meters
The physiographic regions of the contiguous United States comprise 8 divisions, 25 provinces, and 85 sections. [1] The system dates to Nevin Fenneman 's report Physiographic Divisions of the United States, published in 1916. [2] [3] The map was updated and republished by the Association of American Geographers in 1928. [4]
A topographic map of the United States. The United States is the world's third-largest country by total area behind Russia and Canada. [d] [167] [168] The 48 contiguous states and the District of Columbia occupy a combined area of 3,119,885 square miles (8,080,470 km 2).