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Macedonia (Nation) |
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Macquarie Island (Marine Ecoregion of the World (MEOW)) |
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Macquarie Island Exclusive Economic Zone (EEZ) |
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MacRobertson Land (General Region) |
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Madagascan Exclusive Economic Zone (EEZ) |
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Madagascar (Nation) |
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Madeira (Autonomous Region) |
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Madeira (Island) |
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Madeiran Exclusive Economic Zone (EEZ) |
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Madras (State) |
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Magallanes, Chili (Region) |
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Magdalena Transition (Marine Ecoregion of the World (MEOW)) |
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Magellanic (Marine Province) |
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Mahé (Island) |
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Makamby Island (Island) |
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Malacca Strait (IHO Sea Area) |
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Malacca Strait (Marine Ecoregion of the World (MEOW))  has preferred alternative Malacca Strait |
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Malagasy (Nation) |
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Malawi (Nation) |
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Malay Peninsula (Peninsula) |
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Malaysia (Nation) |
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Malaysian Exclusive Economic Zone (EEZ) |
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Maldiven (Nation) |
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Maldives (Nation) |
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Maldives (Marine Ecoregion of the World (MEOW)) |
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Maldivian Exclusive Economic Zone (EEZ) |
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Malediven (Nation) |
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Maledives (Nation) |
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Malindi (Town) |
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Malta (Nation) |
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Malvinas/Falklands (Marine Ecoregion of the World (MEOW)) |
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Mambone (Town) |
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Manicouagan (Marine Protected Area (MPA)) |
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Manning-Hawkesbury (Marine Ecoregion of the World (MEOW)) |
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Mar del Plata (Inhabited Place) |
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Mar Tirreno (IHO Sea Area) |
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Mariana Islands (Marine Ecoregion of the World (MEOW)) |
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Marion Bay (Bay) |
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Marion Island (Island) |
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Marquesas (Marine Province) |
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Marquesas (Marine Ecoregion of the World (MEOW)) |
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Marseille (City) |
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Marseilles (City) |
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Marshall Islands (Archipelago) |
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Marshall Islands (Marine Ecoregion of the World (MEOW)) |
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Marshall, Gilbert and Ellis Islands (Marine Province) |
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Martinique (Dependent State) |
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Mascarene Basin (Basin) |
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Mascarene Islands (Archipelago) |
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Mascarene Islands (Marine Ecoregion of the World (MEOW)) |
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Mascarenes Basin (Basin) |
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Maskarenskaya Kotlovina (Basin) |
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Mauritania (Nation) |
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Mauritanian Exclusive Economic Zone (EEZ) |
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Mauritanie (Nation) |
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Mauritian Exclusive Economic Zone (EEZ) |
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Mauritius (Nation) |
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Mazatlan (Town) |
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McMurdo Sound (Sound) |
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Mediterranean Europe (General Region) |
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Mediterranean Sea (IHO Sea Area) |
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Mediterranean sea (General Sea Area) |
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Mediterranean Sea (Marine Province) has preferred alternative Mediterranean Sea |
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Mediterranean Sea - Eastern Basin (IHO Sea Area) |
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Mediterranean Sea - Western Basin (IHO Sea Area) |
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Mediterranean Sea Area (General Sea Area) |
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Menton (Commune) |
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Mer d'Iroise (IHO Sea Area) |
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Messina (Commune) |
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Mexican Exclusive Economic Zone (EEZ) |
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Mexican Exclusive Economic Zone [Caribbean part] (Marine Region) |
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Mexican Tropical Pacific (Marine Ecoregion of the World (MEOW)) |
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Mexico (Nation) |
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Mexico Gulf (IHO Sea Area) |
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Micronesia (Nation) |
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Micronesian Exclusive Economic Zone (EEZ) |
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Mississippi (State) |
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Mkokotoni (Town) |
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Moldova (Nation) |
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Moluccas (Province (administrative)) |
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Mombasa (City) |
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Monaco (Nation) |
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Monterey Bay (Bay) |
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Montserrat (Dependent State) |
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Moreton Bay (Bay) |
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Moroccan Atlantic (General Sea Area) |
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Moroccan Exclusive Economic Zone (EEZ) |
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Morocco (Nation) |
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Mozambican Exclusive Economic Zone (EEZ) |
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Mozambique (Nation) |
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Mozambique Channel (IHO Sea Area) |
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Murman Coast (Coast) |
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Murmansk Coast (Coast) |
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Murmansk Fjord (Fjord) |
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Murmanskiy Bereg (Coast) |
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Myanma Exclusive Economic Zone (EEZ) |
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Myanmar (Nation) |
