The Dão River is a river located in central Portugal, flowing through the Dão-Lafões region. It is approximately 70 kilometers long and is known for its scenic beauty, winding through lush valleys and vineyards. The river eventually joins the Vouga River, contributing to the region's rich biodiversity. The Dão River is significant for its role in local agriculture, particularly in the production of Dão wine, a renowned Portuguese wine. The river's waters support various ecosystems and provide irrigation for the surrounding farmland, making it an essential resource for the communities along its banks.