Operation Coronado IV was the fourth of the Operation Coronado series of riverine military operations conducted by the U.S. Mobile Riverine Force (MRF), designed to shut down Viet Cong (VC) strongholds in the Mekong Delta. It ran from 19 August to 9 September 1967. It took place in Long An, Gò Công and Kiến Hòa Provinces (now Long An, Tien Giang and Bến Tre Provinces).