Marcus Island (Minami-tori-shima) — Japan
Mariana Islands — Guam; Northern Mariana Islands
Marion Island — South Africa
Marmara, Sea of — Atlantic Ocean
Marquesas Islands (Iles Marquises) — French Polynesia
Marseille [US Consulate General] — France
Martin Vaz, Ilhas — Brazil
Mas a Tierra (Robinson Crusoe — Chile Island)
Mascarene Islands — Mauritius; Reunion
Maseru [US Embassy] — Lesotho