| Country | Terrain |
| Guam | volcanic origin, surrounded by coral reefs; relatively flat coralline limestone plateau (source of most fresh water), with steep coastal cliffs and narrow coastal plains in north, low hills in center, mountains in south |
| Guatemala | mostly mountains with narrow coastal plains and rolling limestone plateau |
| Guernsey | mostly level with low hills in southwest |
| Guinea | generally flat coastal plain, hilly to mountainous interior |
| Guinea-Bissau | mostly low coastal plain rising to savanna in east |
| Guyana | mostly rolling highlands; low coastal plain; savanna in south |
| Haiti | mostly rough and mountainous |
| Heard Island and McDonald Islands | Heard Island - 80% ice-covered, bleak and mountainous, dominated by a large massif (Big Ben) and an active volcano (Mawson Peak); McDonald Islands - small and rocky |
| Holy See (Vatican City) | urban; low hill |
| Honduras | mostly mountains in interior, narrow coastal plains |
| Hong Kong | hilly to mountainous with steep slopes; lowlands in north |
| Hungary | mostly flat to rolling plains; hills and low mountains on the Slovakian border |
| Iceland | mostly plateau interspersed with mountain peaks, icefields; coast deeply indented by bays and fiords |
| India | upland plain (Deccan Plateau) in south, flat to rolling plain along the Ganges, deserts in west, Himalayas in north |
| Indian Ocean | surface dominated by counterclockwise gyre (broad, circular system of currents) in the southern Indian Ocean; unique reversal of surface currents in the northern Indian Ocean; low atmospheric pressure over southwest Asia from hot, rising, summer air results in the southwest monsoon and southwest-to-northeast winds and currents, while high pressure over northern Asia from cold, falling, winter air results in the northeast monsoon and northeast-to-southwest winds and currents; ocean floor is dominated by the Mid-Indian Ocean Ridge and subdivided by the Southeast Indian Ocean Ridge, Southwest Indian Ocean Ridge, and Ninetyeast Ridge |
| Indonesia | mostly coastal lowlands; larger islands have interior mountains |
| Iran | rugged, mountainous rim; high, central basin with deserts, mountains; small, discontinuous plains along both coasts |
| Iraq | mostly broad plains; reedy marshes along Iranian border in south with large flooded areas; mountains along borders with Iran and Turkey |
| Ireland | mostly level to rolling interior plain surrounded by rugged hills and low mountains; sea cliffs on west coast |
| Isle of Man | hills in north and south bisected by central valley |
| Israel | Negev desert in the south; low coastal plain; central mountains; Jordan Rift Valley |
| Italy | mostly rugged and mountainous; some plains, coastal lowlands |
| Jamaica | mostly mountains, with narrow, discontinuous coastal plain |
| Jan Mayen | volcanic island, partly covered by glaciers |
| Japan | mostly rugged and mountainous |
| Jersey | gently rolling plain with low, rugged hills along north coast |
| Jordan | mostly desert plateau in east, highland area in west; Great Rift Valley separates East and West Banks of the Jordan River |
| Kazakhstan | extends from the Volga to the Altai Mountains and from the plains in western Siberia to oases and desert in Central Asia |
| Kenya | low plains rise to central highlands bisected by Great Rift Valley; fertile plateau in west |
| Kiribati | mostly low-lying coral atolls surrounded by extensive reefs |
| Korea, North | mostly hills and mountains separated by deep, narrow valleys; coastal plains wide in west, discontinuous in east |
| Korea, South | mostly hills and mountains; wide coastal plains in west and south |