More than four million dollars worth of cannabis has been found growing mostly in national parks around the Coffs-Clarence region.

Police have been scouring national parks all week looking for cannabis being cultivated among the bushland, and have seized more than 22 hundred plants.

The cannabis has been loaded onto trucks will now be destroyed.

So far one 43-year-old man has been charged, after dozens of plants were found on his property near Dorrigo.

Coffs-Clarence Crime Manager, Detective Inspector Darren Jameson, said taking that quantity of cannabis out of the local drug market will have an enormous impact.

"To take this large amount of cannabis out of the drug supply chain not only hurts the drug dealers, but also affects the users," he said.

"The most important part of this program is to break the cycle and chain of the drug supply in local areas.

"Which of course makes the community safer."

The Cannabis Eradication Program has been running all week, and is wrapping up today.

Detective Inspector Jameson says public tip-offs have played a crucial role in finding the plantations.

"It is a mixture of intelligence and analysis done by the NSW Police, and obviously information that has been provided by the community," he said.

"That is a key part - we have been focusing heavily on our links with the community, and over the past few months we have seen exactly how important that information from the community is in trying to break the drug trade."