More than a million litres of wine was drained from tanks at a Riverland winery earlier this week, sparking a plea for help from the public.

Police believe the property damage occurred at the Monash winery in South Australia some time between 3.00pm on December 28 and 9.00am the following morning.

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About 1.2 million litres of wine was drained from four separate tanks.

Anyone with information about the incident is urged to contact Crime Stoppers.