word | | Terrain |
| hills | Paraguay | grassy plains and wooded hills east of Rio Paraguay; Gran Chaco region west of Rio Paraguay mostly low, marshy plain near the river, and dry forest and thorny scrub elsewhere |
| hills | Russia | broad plain with low hills west of Urals; vast coniferous forest and tundra in Siberia; uplands and mountains along southern border regions |
| hills | Rwanda | mostly grassy uplands and hills; relief is mountainous with altitude declining from west to east |
| hills | Serbia | extremely varied; to the north, rich fertile plains; to the east, limestone ranges and basins; to the southeast, ancient mountains and hills |
| hills | Somalia | mostly flat to undulating plateau rising to hills in north |
| hills | South Africa | vast interior plateau rimmed by rugged hills and narrow coastal plain |
| hills | Spain | large, flat to dissected plateau surrounded by rugged hills; Pyrenees Mountains in north |
| hills | Suriname | mostly rolling hills; narrow coastal plain with swamps |
| hills | Swaziland | mostly mountains and hills; some moderately sloping plains |
| hills | Switzerland | mostly mountains (Alps in south, Jura in northwest) with a central plateau of rolling hills, plains, and large lakes |
| hills | Togo | gently rolling savanna in north; central hills; southern plateau; low coastal plain with extensive lagoons and marshes |
| hills | Trinidad and Tobago | mostly plains with some hills and low mountains |
| hills | United Kingdom | mostly rugged hills and low mountains; level to rolling plains in east and southeast |
| hills | United States | vast central plain, mountains in west, hills and low mountains in east; rugged mountains and broad river valleys in Alaska; rugged, volcanic topography in Hawaii |
| hills | Uruguay | mostly rolling plains and low hills; fertile coastal lowland |