Norwich Green Party members will use canoes to clear litter from the River Wensum this weekend.
The rubbish collection, which takes place on October 21, will be carried out by foot along the river banks and on the water.
It is part of a larger campaign to reduce the amount of plastic thrown away.
Gloves and litter grabbers will be provided for those taking part.
Lesley Grahame, Green councillor for Norwich's Thorpe Hamlet ward, said: 'Plastics thrown into the river are part of the massive global contamination problem that's so damaging to fish stock and other marine life. We believe in building communities and a litter-pick like this offers a great opportunity for everyone to get involved.'
The community litter clean-up starts at 10:30am on Saturday, October 21, meeting in Norwich at the Compleat Angler on Prince of Wales Road.
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