The Marathon River is a significant waterway located in the region of Greece. It flows through the Attica area and is known for its historical importance, particularly during the Battle of Marathon in 490 BC. The river is approximately 20 kilometers long and contributes to the local ecosystem. The river's source is in the Pindus Mountains, and it eventually empties into the Euripus Strait. The surrounding area features diverse flora and fauna, making it a vital habitat for various species. The Marathon River also plays a role in local agriculture, providing irrigation for nearby farms.