- Mobile, Mobile County, Alabama, United States1
- Mohawk River, New York, United States1
- Mohawk, Ulster County, New York, United States1
- Moluccas, Indonesia 1
- Montclair, Essex County, New Jersey, United States1
- Monte Rose, Liguria, Italy1
- Montgomery, Montgomery County, Alabama, United States1
- Monticello, Jefferson County, Florida, United States1
- Mount Holyoke, Hampshire County, Massachusetts, United States1
- Mount Vesuvius, Napoli province, Campania, Italy1
- Mt. Etna, Sicily, Italy1
- Mumbai, India1
- Murray County, Georgia, United States1
- Neidermennig, Rheinland, Germany1
- Neshaminy Creek, Philadelphia County, Pennsylvania, United States1
- New Almaden District, Santa Cruz Mountains, Santa Clara County, California, United States1
- New Bedford, Bristol County, Massachusetts, United States1
- New York Bay1
- New York, New York County, New York, United States1
- Newberry, Newberry County, South Carolina, United States1