South Wales Police have launched an intensive 10 week campaign against anti-social, dangerous and often criminal activities on land in three valley communities.
Officers are working closely with fire fighters and Forestry Commission staff to combat off-road motor bikers, arsonists who start grass fires and illegal fly-tippers.
Operation Pitman will concentrate on the highly populated Cynon, Merthyr and Rhymney Valleys. The aim is to protect farmland and livestock, forestry plantations and law abiding people who want to enjoy the countryside.
Supporters also hope the clampdown will encourage investment in areas where traditional industries like coal mining have disappeared. Tourism is also likely to benefit from improvements to the appearance and safety of common land.