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Mablethorpe
Maenporth
Maidenhead
Maidenhead to Sunbury catchment
Malmesbury (Wiltshire)
Manaccan (Cornwall)
Manaccan River (Cornwall)
Mar dyke
Mardike
Mardyke (Essex)
Marsh
Marsh Dykes (Woolwich) subcatchment
Marwood (Devon)
Meavy (Dartmoor)
Medlock (Manchester)
Medway (Sussex, Kent)
Medway catchment
Medway Estuary
Melton
Melton Mowbray
Meon (Hampshire)
Mere
Mersea Island
Mersey
Mersey Estuary catchment
Merseyside
Merthyr Tudful
Merthyr Tydfil
Mid Wales
Middle Dee catchment
Midford Brook
Midlands (England)
Midlothian
Mimram
Minehead
Minsmere
Misbourne
Mole
Mole catchment
Monmouthshire
Moor
Moors River (Dorset)
Moray
Morecambe Bay
Moretonhampstead
Mount's Bay (Cornwall)
Mounts Bay (Cornwall)
Mudflat
Murray (Australia)
Murray River