| Country | Terrain |
| Afghanistan | mostly rugged mountains; plains in north and southwest |
| Akrotiri | void |
| Albania | mostly mountains and hills; small plains along coast |
| Algeria | mostly high plateau and desert; some mountains; narrow, discontinuous coastal plain |
| American Samoa | five volcanic islands with rugged peaks and limited coastal plains, two coral atolls (Rose Island, Swains Island) |
| Andorra | rugged mountains dissected by narrow valleys |
| Angola | narrow coastal plain rises abruptly to vast interior plateau |
| Anguilla | flat and low-lying island of coral and limestone |
| Antarctica | about 98% thick continental ice sheet and 2% barren rock, with average elevations between 2,000 and 4,000 meters; mountain ranges up to nearly 5,000 meters; ice-free coastal areas include parts of southern Victoria Land, Wilkes Land, the Antarctic Peninsula area, and parts of Ross Island on McMurdo Sound; glaciers form ice shelves along about half of the coastline, and floating ice shelves constitute 11% of the area of the continent |
| Antigua and Barbuda | mostly low-lying limestone and coral islands, with some higher volcanic areas |
| Arctic Ocean | central surface covered by a perennial drifting polar icepack that, on average, is about 3 meters thick, although pressure ridges may be three times that thickness; clockwise drift pattern in the Beaufort Gyral Stream, but nearly straight-line movement from the New Siberian Islands (Russia) to Denmark Strait (between Greenland and Iceland); the icepack is surrounded by open seas during the summer, but more than doubles in size during the winter and extends to the encircling landmasses; the ocean floor is about 50% continental shelf (highest percentage of any ocean) with the remainder a central basin interrupted by three submarine ridges (Alpha Cordillera, Nansen Cordillera, and Lomonosov Ridge) |
| Argentina | rich plains of the Pampas in northern half, flat to rolling plateau of Patagonia in south, rugged Andes along western border |
| Armenia | Armenian Highland with mountains; little forest land; fast flowing rivers; good soil in Aras River valley |
| Aruba | flat with a few hills; scant vegetation |
| Ashmore and Cartier Islands | low with sand and coral |
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