The PSNI seized cannabis plants worth an estimated £125,000 from a house in the Limavady area on Wednesday.
The property was described by officers as “a substantial cannabis factory”, and two men – aged 46 and 53 – have been arrested.
Detective Chief Inspector Colin Gillis said in a statement: “Detectives from Reactive and Organised Crime Branch are committed to tackling illegal drugs and other criminal activities and in keeping communities safe.
“I continue to appeal to members of the public to come forward with any information about the supply or use of illegal drugs or criminal activity. Anyone with any information can call police on 101 or Crimestoppers anonymously on 0800 555 111.”