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Collection place
- Macas, Ecuador1
- Machondo, Angola1
- Mackenzie River, Northwest Territories, Canada5
- Mad River near Korbel and Blue Lake, Humboldt County, California7
- Mad River, Humboldt County, California29
- Madagascar2
- Madera County, California100
- Madhya Pradesh, India7
- Magata, Mishima, Onuma District1
- Maharashtra State, India2
- Mahé Island, Seychelles Islands1
- Maine13
- Malakleet, Unknown Borough, Alaska1
- Malawi1
- Malay Peninsula, Southeast Asia51
- Malaysia36
- Mali4
- Manaus, Amazonas State, Brazil1
- Manchester, Mendocino County, California1
- Manchester-Point Arena Rancheria, Point Arena, Mendocino County1