The Koppu River is a significant waterway located in the Philippines, primarily flowing through the province of Pangasinan. It is known for its scenic beauty and plays a vital role in the local ecosystem, supporting various plant and animal species. The river is also important for irrigation, helping to sustain agriculture in the surrounding areas. The Koppu River is approximately 50 kilometers long and eventually merges with the Agno River. It serves as a source of water for nearby communities and is often used for fishing and recreational activities. The river's health is crucial for the livelihoods of many residents who depend on its resources.