| Country | Terrain |
| 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 |
| Kosovo | flat fluvial basin with an elevation of 400-700 m above sea level surrounded by several high mountain ranges with elevations of 2,000 to 2,500 m |
| Kuwait | flat to slightly undulating desert plain |
| Kyrgyzstan | peaks of Tien Shan and associated valleys and basins encompass entire nation |
| Laos | mostly rugged mountains; some plains and plateaus |
| Latvia | low plain |
| Lebanon | narrow coastal plain; El Beqaa (Bekaa Valley) separates Lebanon and Anti-Lebanon Mountains |
| Lesotho | mostly highland with plateaus, hills, and mountains |
| Liberia | mostly flat to rolling coastal plains rising to rolling plateau and low mountains in northeast |
| Libya | mostly barren, flat to undulating plains, plateaus, depressions |
| Liechtenstein | mostly mountainous (Alps) with Rhine Valley in western third |
| Lithuania | lowland, many scattered small lakes, fertile soil |