The Trieux River is a river located in the northern part of France. It flows through the Côtes-d'Armor department and is approximately 50 kilometers long. The river is known for its scenic beauty and is a popular spot for outdoor activities such as fishing and kayaking. The Trieux River eventually empties into the English Channel near the town of Paimpol. Its basin supports a variety of wildlife and contributes to the local ecosystem. The river also plays a role in the region's agriculture, providing irrigation for nearby farms.