The Alvão River is a river located in northern Portugal, flowing through the picturesque region of Alvão Natural Park. It is known for its clear waters and beautiful landscapes, making it a popular spot for nature lovers and outdoor activities. The river contributes to the local ecosystem and supports various wildlife. The Alvão River is approximately 30 kilometers long and eventually merges with the Douro River, one of Portugal's major rivers. The surrounding area features stunning waterfalls and hiking trails, attracting visitors who enjoy exploring the natural beauty of the region.