word | | Terrain |
| rolling | United Kingdom | mostly rugged hills and low mountains; level to rolling plains in east and southeast |
| rolling | Uruguay | mostly rolling plains and low hills; fertile coastal lowland |
| rolling | Uzbekistan | mostly flat-to-rolling sandy desert with dunes; broad, flat intensely irrigated river valleys along course of Amu Darya, Syr Darya (Sirdaryo), and Zarafshon; Fergana Valley in east surrounded by mountainous Tajikistan ... |
| Rose | American Samoa | five volcanic islands with rugged peaks and limited coastal plains, two coral atolls (Rose Island, Swains Island) |
| Ross | Antarctica | ... 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 ... |
| rough | Haiti | mostly rough and mountainous |
| rounded | Bahamas, The | long, flat coral formations with some low rounded hills |
| rounded | Malawi | narrow elongated plateau with rolling plains, rounded hills, some mountains |
| rugged | Afghanistan | mostly rugged mountains; plains in north and southwest |
| rugged | American Samoa | five volcanic islands with rugged peaks and limited coastal plains, two coral atolls (Rose Island, Swains Island) |
| rugged | Andorra | rugged mountains dissected by narrow valleys |
| rugged | Argentina | rich plains of the Pampas in northern half, flat to rolling plateau of Patagonia in south, rugged Andes along western border |
| rugged | Atlantic Ocean | ... 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 |