Everything from the remains of a horse to an old armchair were removed from the banks of the Cardrona River just east of Wanaka this week.
More than a dozen volunteers organised by the Mt Barker Residents' Association cleared rubbish from several kilometres of the river between State Highway 6 and a point beyond the Ballantyne Rd bridge.
In two hours they picked up 1.14 tonnes of rubbish.
Secretary Chrissie Thomson said it was "so sad" some people regarded the area as a tip.
"We found household rubbish, three cars, parts of a dead horse, a lamb, part of a pig, parts of deer, dead fish in bags, chilly bins of old food, clothing, old furniture, drums, tyres, bits of metal, iron, books, bottles, camping gear, you name it."