$16m cannabis haul seized in northern NSW

More than $16 million worth of cannabis plants have been seized across northern NSW in targeted November raids.

More than 4000 plants were found in eight separate locations last week as NSW Drug Squad and local officers were provided a bird's eye view by the Police Air Wing.

The seizures followed the discovery of an 8500-plant crop bordered by a stockproof fence in the Bundjalung National Park on November 11.

Cannabis-growing season extends from late spring to early autumn.