| Main Boundary Fault, Himalayan Front, 138 | Maine, Casco Bay, 368 |
| Makran coast, Pakistan, 372 | Makran Ranges, Southwest Asia, 126 |
| Makteir desert, Mauritania, 98 | Malagasy Republic, Madagascar, 80 |
| Malaspina Glacier, Alaska, 550, 570 | Mali, Niger River, 298 |
| Manaus, Brazil, 302 | Mangrove swamp, Australia, 360 |
| Manicouagan, Quebec, Canada, 174 | Manitoba, Canada, 578 |
| Marble Canyon, Arizona, 272 | Mare Imbrium, Moon, 602 |
| Mare Tranquillitatis, Moon, 604 | Marginal sea coasts, 353 |
| Marlborough Sounds, New Zealand, 376 | |
| Mars | |
| Olympus Mons, 610 | outflow channels, 614 |
| Valles Marineris, 612 | Marshall Islands, atolls, 392 |
| Martian moons, Phobos, Deimos, 616 | Martian sand seas, 449, 488 |
| Maryland, Chesapeake Bay, 400 | Massachusetts, Cape Cod, 584 |
| Mauna Kea, Hawaii, 212 | Mauna Loa, Hawaii, 212 |
| Mauritania, Richât structure, 98 | Meandering channel, Ganges/Brahmaputra River, 328 |
| Meandering pattern, 257 | |
| Medial moraine | |
| Iceland, 568 | Switzerland, 568 |
| Median Tectonic Line, Japan, 156, 240 | Mediterranean, volcanism, 224 |
| Mega-geomorphology, 1, 658 | Mekong River delta, Vietman, 319, 334 |
| Merapi, Indonesia, 246 | |
| Mercury | |
| Caloris Basin, 606 | lineated terrain, 608 |
| Mesa Verde, Colorado, 12 | |
| Meteor impact | |
| examples, 174 | Mauritania, 98 |
| Meteorites, Antarctica, 527 | |
| Mexico | |
| Colorado River delta, 344 | karst, Yucatan, 418 |
| Sierra Madre Oriental, 70 | Sonoran Desert, 480 |
| Micronesia, atolls, 392 | Mid-Atlantic ridge, 222 |
| Middle East, Landsat mosaic, 112 | Midlatitude deserts, 448 |
| Mimas, 630 | Miranda, 632 |
| Mississippi River, 278 | Mississippi River delta, U.S.A., 319, 320 |
| Moine thrust, Scotland, 78 | Mojave Desert, 6, 484 |
| Monsoon deserts, 448 | Monument Upwarp, Utah, 12 |
| Moon | |
| Apennines, 602 | lunar maria, 604 |
| Mare Imbrium, 602 | Tycho, 600 |
| Moraines, classification, 535 | Morocco, Anti Atlas Mountains, 94 |
| Morphostructural analysis, 5 | Mount Ararat, Turkey, 226 |
| Mount Aso, Japan, 240 | Mount Egmont, New Zealand, 248 |
| Mount Erebus, Antarctica, 538 | Mount Etna, Italy, 224 |
| Mount Mazama, Oregon, 202 | Mount Mckinley, Alaska, 554, 666 |
| Mount St. Helens, Washington, 206 | Mt. Everest, Nepal, 138 |
| Mt. Fuji, Japan, 240 | Mt. Kenya, Africa, 106, 230 |
| Mt. Kilimanjaro, Africa, 106 | Mt. Mckinley, Alaska, 50 |
| Mu Us Sandy Land, China, 502 | Multispectral scanner images, 682 |
| Nacimiento Fault, New Mexico, 194 | Nain Province, 64 |
| Namib Desert, South Africa, 474 | |
| Namibia | |
| Damara Mountain Belt, 100 | sedimentary basin, 80 |
| Nanga Parbat, 126 | Nebraska Sand Hills, 486 |
| New Mexico, Valles Caldera, 194 | New South Wales, Australia, 647 |
| New Zealand | |
| Alpine Fault, 168 | Marlborough Sounds, 376 |
| volcanism, 248 | Canterbury coast, 374 |
| Ngauruhoe, New Zealand, 248 | Niger, Air Mountains, 173 |
| Niger River, Mali, 298 | Nigerian shield, 170 |
| Nile delta, Egypt, 317, 318 | |
| North Carolina | |
| coastline, 378 | oriented lakes, 432 |
| Northwest Territories, Canada, 66 | Norway, fjords, 364, 564 |
| Nubian sandstone, 18 | Nullarbor Plain, Australia, 424 |
| Oaklahoma, Ouachita Mountains, 60 | Ob River Valley, Siberia, U.S.S.R., 428 |
| Oberon, 632 | Oca Fault, 72 |
| Ohio river, Ohio, 310 | Olduvai Gorge, Africa, 230 |
| Olympic Mountains, 32 | Olympus Mons, Mars, 610 |
| Oman, ophiolites, 120 | |
| Ophiolites | |
| Cyprus, 120 | Oman, 120 |
| Ord River, Australia, 164 | Oregon, volcanism, 202 |
| Oriented Lakes | |
| Alaska, 430 | Bolivia, 434 |
| Carolina Bays, 432 | Ouachita Mountain fold belt, 60 |
| Outflow channels, Mars, 614 | |
| Outlet glacier | |
| Iceland, 548 | Vatnajökull, Iceland, 529 |
| Outwash plain, Iceland, 580 | Pacific Coastal Plain Province, 216 |
| Pacific Northwest, Landsat mosaic, 200 | |
| Pacific type coasts, 354 | |
| Alaska, 364 | Pakistan, 372 |
| Padre Island barrier, Texas, 362 | |
| Pakistan | |
| Indus River delta, 348 | Landsat mosaic, 126 |
| Makran coast, 372 | Zhob Valley, 130 |
| Zinda Pir, 132 | |
| Paleochannels, 18, 259 | Paleodeserts, 449 |
| Palimpsest, 27 | Pamirs, 126 |
| Pamlico Sound, North Carolina, 378 | Panamint Range, California, 40 |
| Pantanal Plains, Brazil, 300 | |
| Parabolic dunes, 455 | Thar Desert, India, 500 |
| Paradox Valley, Colorado, 12 | Paraguay River, Brazil, 300 |
| Paredon basin, Mexico, 70 | Paris Basin, France, 80 |
| Parry Island fold belt, 68 | Patagonia, ice field, 544 |
| Patterned ground, 5 | |
| Lena River delta, 342 | Pearl (Hsi) River delta, China, 332 |
| Pecos River, Texas, 260 | Peléan volcanism, 187 |
| Pennine Alps, 82, 86 | Periglacial, 5 |
| Periglacial landforms, 534 | |
| Permafrost, 5 | |
| Alaska, 430 |