The Markham River is a river located in the northern region of Papua New Guinea. It flows through the Markham Valley, an area known for its fertile land and agricultural activities. The river is an important water source for local communities and supports various ecosystems along its banks. The Markham River eventually joins the Ramu River, which is a significant waterway in the region. The river's basin is home to diverse wildlife and plays a crucial role in the local economy, particularly in farming and fishing activities.