- The United States of America is the third largest country in the world by area and has a varied topography.
- The Country is borders both the North Atlantic and North Pacific Oceans and is bordered by Canada and Mexico.
- The land area of the contiguous United States is approximately 1,900 million acres (7,700,000 km2).
- Alaska, separated from the contiguous United States by Canada, is the largest state at 365 million acres (1,480,000 km2).
- Hawaii, occupying an archipelago in the central Pacific, southwest of North America, has just over 4 million acres (16,000 km2)
- The eastern regions consist of hills and low mountains while the central interior is a vast plain (called the Great Plains region) and the west has high rugged mountain ranges (some of which are volcanic in the Pacific Northwest).
- Alaska also features rugged mountains as well as river valleys.
- Hawaii's landscape varies but is dominated by volcanic topography.
The United States, with its large size and geographic variety, includes most climate types.
- To the east of the 100th meridian, the climate ranges from humid continental in the north to humid subtropical in the south.
- The southern tip of Florida is tropical, as is Hawaii.
- The Great Plains west of the 100th meridian are semi-arid.
- Much of the Western mountains are alpine.
- The climate is arid in the Great Basin,
- It is desert in the Southwest,
- It is mediterranean in coastal California,
- It is oceanic in coastal Oregon and Washington and southern Alaska.
- Most of Alaska is subarctic or polar.
- Extreme weather is not uncommon—the states bordering the Gulf of Mexico are prone to hurricanes, and most of the world's tornadoes occur within the country, mainly in the Midwest's Tornado Alley.
Here is a list of pages about the USA: