| Country | Terrain |
| Atlantic Ocean | surface usually covered with sea ice in Labrador Sea, Denmark Strait, and coastal portions of the Baltic Sea from October to June; clockwise warm-water gyre (broad, circular system of currents) in the northern Atlantic, counterclockwise warm-water gyre in the southern Atlantic; the ocean floor is dominated by the Mid-Atlantic Ridge, a rugged north-south centerline for the entire Atlantic basin |
| Australia | mostly low plateau with deserts; fertile plain in southeast |
| Austria | in the west and south mostly mountains (Alps); along the eastern and northern margins mostly flat or gently sloping |
| Azerbaijan | large, flat Kur-Araz Ovaligi (Kura-Araks Lowland) (much of it below sea level) with Great Caucasus Mountains to the north, Qarabag Yaylasi (Karabakh Upland) in west; Baku lies on Abseron Yasaqligi (Apsheron Peninsula) that juts into Caspian Sea |
| Bahamas, The | long, flat coral formations with some low rounded hills |
| Bahrain | mostly low desert plain rising gently to low central escarpment |
| Bangladesh | mostly flat alluvial plain; hilly in southeast |
| Barbados | relatively flat; rises gently to central highland region |
| Belarus | generally flat and contains much marshland |
| Belgium | flat coastal plains in northwest, central rolling hills, rugged mountains of Ardennes Forest in southeast |
| Belize | flat, swampy coastal plain; low mountains in south |
| Benin | mostly flat to undulating plain; some hills and low mountains |
| Bermuda | low hills separated by fertile depressions |
| Bhutan | mostly mountainous with some fertile valleys and savanna |
| Bolivia | rugged Andes Mountains with a highland plateau (Altiplano), hills, lowland plains of the Amazon Basin |
| Bosnia and Herzegovina | mountains and valleys |
| Botswana | predominantly flat to gently rolling tableland; Kalahari Desert in southwest |
| Bouvet Island | volcanic; coast is mostly inaccessible |