The "Star trek" canon concordance
Places: M is for Mountain
- M-24 Alpha System (?Alpha Quadrant): Providers: Kidnap Chekov, Kirk and Uhura
- Malurian System (UFP): Sterilisation: (Nomad/Tan Ru)
- Mantua (Italy, Europe, Earth): EMH: Refers to in introduction to Dona e mobile
- Manzar Colony (Gorin II, UFP): USS Enterprise-E: (Territorial dispute negotiations)
- Maquis camp (DMZ): Bashir, Kira and Sisko: Imprisonment
- Mariah System (Alpha Quadrant): Caretaker: Maquis raider: Transfer to Delta Quadrant; USS Voyager: Transfer to Delta Quadrant
- Market Street (Earth): Starfleet: (USS Voyager welcome home ticker-tape parade)
- Mars Colony (Mars, UFP, Alpha Quadrant): Colonists: (Fear Vampire attacks)
- Mars Colony #3 (Mars, UFP, Alpha Quadrant): Mira Romaine: (Birth)
- Marseilles (France, Europe, Earth): Cosimo Reality: Kim, Harry: Sandrine's - Paris: (Break from Starfleet Academy)
- Marshlands (Oshionian Prime, Delta Quadrant): Holoprogram: (Neelix)
- Matrix, The: Cerebral cortex being: Possesses Janeway
- Maxia Zeta System (Alpha Quadrant): Ferengi Alliance ship: (Battle of Maxia) - Moon: Deep crater: (Ferengi Alliance ship hides) - USS Stargazer: (Battle of Maxia)
- Maximum Security Detention Facility (Akritirian space, Delta Quadrant): Kim 2 and Paris: Imprisonment
- McKinley Park: Lessing, Noah: (Maintenance)
- McKinley Rocket Base (Earth): Seven, Gary: Timeline alteration
- McKinley Station (Earth orbit): Video feed: Live: Operation Watson
- Mediterranean Sea (Earth): Orbit: Picard attacks Borg on USS Enterprise-E Deflector Dish
- Mekong River (Thailand, Asia, Earth): USS Mekong: (Eponymous)
- Mempa: Klingon Empire: Famous land battle
- Mental hospital (UFP): USS Enterprise: Delivers supplies
- Mental hospital (Elba II, UFP): Governor: Donald Cory - Inmates: (15) - Uprising: Garth
- Metreon cloud (Rinax, Delta Quadrant): Residents: Disintegrates
- Metro Plaza (Earth): EMH: (Honeymoon)
- Micromius: (Disaster)
- Middle East (Earth): Orbit: Picard attacks Borg on USS Enterprise-E Deflector Dish
- Military installation (Salinia Prime): Druoda Weapon: Targets - Location: Grid 11, Vector 9341
- Minefield (Near Bajoran System): Klingon Empire: (Cloaked and Stationary) - USS Defiant: Detonates
- Minefield (Salina Prime subspace): Druoda Fleet: Maps - Druoda Weapon: Provides safe course - USS Voyager: Negotiates
- Minorah Shipyards (Cardassian Union): Destruction: (Klingon Empire Fleet)
- Minsk (Russia, Europe, Earth): Worf: Recommends O'Briens reside
- Mir Station (Orbital, Earth): Kelly, John: Kumagawa mistakes fragment for UFO
- Mira System (UFP): Planetology: Mining: (Dytallix Mining Co); Planets: (6)
- Mirror Universe: See Mirror universe
- Missile silo (Friendship One planet): Opening: Verin
- Mission District (San Francisco, USA, North America, Earth): Cosimo Reality: Kim and Libby: Reside
- Monarch System (Cardassian Union): Alpha Quadrant Alliance: (Assault fails) - Dominion: (Major shipyards), Klingon Empire Fleet: (Fails to destroy)
- Monastery (Bajor): Bareil, Antos: Abbott - Kira, Nerys: Investigates Kendra Valley Massacre
- Monastery (Beta Quadrant): Torres, Miral: (Installs Torres to teach honour and discipline)
- Monitor post (Gamma Tauri IV): Starfleet: (Unmanned) - T-9 energy converter: (Daimon Tarr steals)
- Montana (USA, North America, Earth): Human/Vulcan first contact - Phoenix: Base
- Morgana Quadrant: USS Enterprise-D: En route - Charting
- Morrok cave (Crysata moon, Drayan II, Delta Quadrant): Drayan: (First spark of life)
- Morska Listening Post (Klingon Empire, Beta Quadrant): USS Enterprise-A: Deception
- Mount Everest (Nepal, Asia, Earth): Bashir spy holoprogram: Doctor Noah's Headquarters
- Mount Selaya (Vulcan): Spock: Katra re-integration
- Mountains of Antelope Women (Spiritual): Torres: Diverts Chakotay
- Mountain resort (Cytrax V, possibly Delta Quadrant): Holoprogram: Deuterium Neelix: (Honeymoon)
- Mousilla Province (Bajor): Planetology: (Holana River), (Desirable housing), (Large wooded areas), (University)
