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| River Name | Wikipedia Link | Notes |
|---|---|---|
| MohneMaine | https://en.wikipedia.org/wiki/MöhneMainRiver_Maine_(County_Kerry) | |
| Mulkear/Mulcair | https://en.wikipedia.org/wiki/Main_(river)MurMulkear_River | Pronounced "mull-care |
| Mawddach | https://en.wikipedia.org/wiki/MurAfon_(river)Mawddach | |
| MarneMachrihanish | https://en.wikipedia.org/wiki/MarneMachrihanish_(river)Bay | |
| MezaMinsmere | https://en.wikipedia.org/wiki/MežaMinsmere_River | |
| MeuseMondego | https://en.wikipedia.org/wiki/MeuseMondego_River | |
| Moselle | https://en.wikipedia.org/wiki/Moselle | flows through Germany, Luxembourg, France, and the basin is in Belgium |
| Morava | https://en.wikipedia.org/wiki/Morava_(river) | |
| Medveditsa | https://en.wikipedia.org/wiki/Medveditsa_(Volga) |