UpAlphabetical listing of Places in World
| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
| Rio Macha | city | Sucre | Venezuela | 10.25 | -63.62 | 2509 | 1993 |
| Rio Macho | city | Sucre | Venezuela | 10.25 | -63.62 | 2509 | 1993 |
| Rio Madre | city | Limon | Costa Rica | 9.99 | -83.15 | 203 | 20863 |
| Rio Magna | city | Saint Catherine | Jamaica | 18.21 | -76.97 | 1669 | 21627 |
| Rio Magno | city | Saint Catherine | Jamaica | 18.21 | -76.97 | 1669 | 21627 |
| Rio Maina | city | Santa Catarina | Brazil | -28.68 | -49.45 | 396 | 68390 |
| Rio Maior | city | Aveiro | Portugal | 40.98 | -8.59 | 380 | 102269 |
| Rio Maior | city | Santarem | Portugal | 39.34 | -8.94 | 223 | 12094 |
| Rio Malo | city | | Dominican Republic | 19.27 | -71.15 | 2893 | 25933 |
| Rio Mamey | city | Oaxaca | Mexico | 16.85 | -95.78 | 3415 | 1720 |
| Rio Manso | city | Minas Gerais | Brazil | -20.27 | -44.32 | 3349 | 4271 |
| Rio Manso | city | Mato Grosso | Brazil | -14.90 | -55.41 | 1732 | 4 |
| Rio Manso | city | Mato Grosso | Brazil | -14.68 | -56.25 | 830 | 2185 |
| Rio Manso | city | Minas Gerais | Brazil | -22.37 | -45.32 | 3349 | 10732 |
| Rio Manso | city | Mato Grosso | Brazil | -15.65 | -55.32 | 2509 | 446 |
| Rio Manso | city | Sao Paulo | Brazil | -23.37 | -45.40 | 2880 | 3319 |
| Rio Manso | city | Rio de Janeiro | Brazil | -22.34 | -43.31 | 2509 | 3740 |
| Rio Manso Chapuco | city | Los Lagos | Chile | -41.02 | -72.52 | 2509 | 619 |
| Rio Manuel | city | Santa Rosa | Guatemala | 14.10 | -90.12 | 1669 | 12346 |
| Rio Manzano | city | Cordoba | Argentina | -30.70 | -64.20 | 2509 | 283 |
| Rio Mar | city | Para | Brazil | -7.25 | -53.70 | 830 | 0 |
| Rio Mar | city | Rio de Janeiro | Brazil | -23.00 | -43.41 | 32 | 436482 |
| Rio Mar | city | La Habana | Cuba | 23.13 | -82.23 | 101 | 135700 |
| Rio Mar | city | Panama Oeste | Panama | 8.45 | -79.97 | 0 | 2298 |
| Rio Marabasco | city | Colima | Mexico | 19.23 | -104.53 | 275 | 5281 |
| Rio Marañón | city | Navarra | Spain | 42.63 | -2.44 | 2509 | 815 |
| Rio Maria | city | Para | Brazil | -7.32 | -50.05 | 830 | 596 |
| Rio Maria | city | Veracruz | Mexico | 20.29 | -97.40 | 383 | 7084 |
| Rio Mariato | city | Herrera | Panama | 7.67 | -80.83 | 1669 | 2218 |
| Rio Marina | city | Toscana | Italy | 42.82 | 10.42 | 95 | 5181 |
| Rio Marinho | city | Espirito Santo | Brazil | -20.36 | -40.36 | 26 | 233488 |
| Rio Marivela | city | Sucre | Venezuela | 10.62 | -62.51 | 272 | 9962 |
| Rio Martin | city | Tanger-Tetouan | Morocco | 35.62 | -5.28 | 3 | 71998 |
| Rio Martine | city | Tanger-Tetouan | Morocco | 35.62 | -5.28 | 3 | 71998 |
| Rio Mau | city | Braga | Portugal | 41.69 | -8.51 | 830 | 13338 |
| Rio Mau | city | Viana do Castelo | Portugal | 41.65 | -8.58 | 830 | 12478 |
| Rio Mau | city | Vila Real | Portugal | 41.46 | -7.87 | 2509 | 4710 |
| Rio Mau | city | Porto | Portugal | 41.40 | -8.68 | 190 | 23161 |
| Rio Mau | city | Porto | Portugal | 41.17 | -8.18 | 830 | 25918 |
| Rio Mau | city | Porto | Portugal | 41.06 | -8.37 | 830 | 15687 |
| Rio Mayo | city | Sonora | Mexico | 28.64 | -111.59 | 75 | 894 |
| Rio Mayo Airport | airport | | | -45.70 | -70.25 | 1784 | 0 |
| Rio Mayor Solano | city | Baja California | Mexico | 32.13 | -115.28 | 104 | 1192 |
| Rio Medio | city | Oaxaca | Mexico | 16.06 | -96.75 | 3349 | 6882 |
| Rio Mela | city | Oaxaca | Mexico | 16.82 | -95.71 | 2736 | 602 |
| Rio Mendoza | city | Guanajuato | Mexico | 20.69 | -101.21 | 5895 | 23309 |
| Rio Metates | city | Oaxaca | Mexico | 17.12 | -97.99 | 3674 | 2002 |
| Rio Meão | city | Aveiro | Portugal | 40.96 | -8.58 | 830 | 76364 |
| Rio Micos | city | San Luis Potosi | Mexico | 22.10 | -99.15 | 830 | 4470 |
| Rio Mijangos | city | Oaxaca | Mexico | 16.39 | -96.35 | 5249 | 4390 |
| Rio Milheiros | city | Viseu | Portugal | 40.45 | -8.17 | 830 | 5690 |
| Rio Mina | city | Oaxaca | Mexico | 16.79 | -96.00 | 4189 | 1341 |
| Rio Minas | city | Oaxaca | Mexico | 17.00 | -96.86 | 6181 | 16462 |
| Rio Miriumi | city | Morona-Santiago | Ecuador | -2.47 | -78.15 | 3408 | 2399 |
| Rio Molino | city | Oaxaca | Mexico | 15.94 | -96.51 | 2066 | 11202 |
| Rio Molino | city | Oaxaca | Mexico | 16.08 | -96.47 | 7549 | 4898 |
| Rio Molino | city | Junin | Peru | -11.74 | -75.61 | 13428 | 6164 |
| Rio Moreno | city | Veracruz | Mexico | 18.68 | -96.65 | 830 | 9777 |
| Rio Mortero | city | San Luis Potosi | Mexico | 21.53 | -100.52 | 6709 | 3297 |
| Rio Morto | city | Rio Grande do Norte | Brazil | -5.18 | -37.31 | 124 | 85947 |
| Rio Mosquera | city | Colon | Panama | 9.18 | -80.09 | 154 | 2534 |
| Rio Mucuba | city | Nampula | Mozambique | -15.25 | 38.25 | 1856 | 1639 |
| Rio Muerto | city | Formosa | Argentina | -23.62 | -61.32 | 830 | 0 |
| Rio Mulato | city | Potosi | Bolivia | -19.70 | -66.78 | 12588 | 298 |
| Rio Mundel | city | Parana | Brazil | -25.10 | -48.75 | 2047 | 1072 |
| Rio Mundel | city | Parana | Brazil | -25.12 | -48.74 | 1991 | 1157 |
| Rio Mundél | city | Parana | Brazil | -25.12 | -48.76 | 2509 | 1131 |
| Rio Muqui | city | Espirito Santo | Brazil | -20.99 | -41.00 | 196 | 5794 |
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