Prosser RiverThe Prosser River is a river in Tasmania, Australia. The river flows into the Tasman Sea.EnvironmentThe Prosser River Reserve is home to at least 11 at-risk plant and animal species. The Prosser River is virtually unnavigable except at maximum tide. The Old Convict Road trail follows the northern side of the Prosser River for 1km.PoliticsThe river gives its name to the electoral division of Prosser.