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- Makassar Strait - between Borneo and Sulawesi
- Maliku Kandu - Maldives
- Malta Channel - between Malta and Sicily
- Mare Island Strait - California
- Marie-Galante Passage - Guadeloupe
- Martinique Channel - between Saint Vincent and the Grenadines and Grenada
- Martinique Passage - between Dominica and Martinique
- McClure Strait - Melville Island and Banks Island
- Menai Strait - between Anglesey and mainland Wales
- The Minch - between Outer Hebrides and mainland Scotland
- Mindoro Strait - between Mindoro and Palawan in the Philippines
- Mona Passage - between Hispaniola and Puerto Rico
- Myeongnyang Strait - between Jindo Island and mainland South Korea
- Mytilini Strait - between Turkey and the Greek island Lesbos
Read more about this topic: List Of Straits