| Country | Terrain |
| Macedonia | mountainous territory covered with deep basins and valleys; three large lakes, each divided by a frontier line; country bisected by the Vardar River |
| Madagascar | narrow coastal plain, high plateau and mountains in center |
| Malawi | narrow elongated plateau with rolling plains, rounded hills, some mountains |
| Malaysia | coastal plains rising to hills and mountains |
| Maldives | flat, with white sandy beaches |
| Mali | mostly flat to rolling northern plains covered by sand; savanna in south, rugged hills in northeast |
| Malta | mostly low, rocky, flat to dissected plains; many coastal cliffs |
| Marshall Islands | low coral limestone and sand islands |
| Mauritania | mostly barren, flat plains of the Sahara; some central hills |
| Mauritius | small coastal plain rising to discontinuous mountains encircling central plateau |
| Mayotte | generally undulating, with deep ravines and ancient volcanic peaks |
| Mexico | high, rugged mountains; low coastal plains; high plateaus; desert |
| Micronesia, Federated States of | islands vary geologically from high mountainous islands to low, coral atolls; volcanic outcroppings on Pohnpei, Kosrae, and Chuuk |
| Moldova | rolling steppe, gradual slope south to Black Sea |
| Monaco | hilly, rugged, rocky |
| Mongolia | vast semidesert and desert plains, grassy steppe, mountains in west and southwest; Gobi Desert in south-central |
| Montenegro | highly indented coastline with narrow coastal plain backed by rugged high limestone mountains and plateaus |
| Montserrat | volcanic island, mostly mountainous, with small coastal lowland |
| Morocco | northern coast and interior are mountainous with large areas of bordering plateaus, intermontane valleys, and rich coastal plains |
| Mozambique | mostly coastal lowlands, uplands in center, high plateaus in northwest, mountains in west |