The River Ceiriog is a river located in Wales, flowing through the picturesque Ceiriog Valley. It is a tributary of the River Dee and stretches approximately 20 kilometers. The river is known for its scenic beauty, surrounded by lush greenery and rolling hills, making it a popular spot for walking and nature enthusiasts. The river's source is found in the Berwyn Mountains, and it meanders through several small villages, including Glyn Ceiriog and Llangollen. The River Ceiriog supports local wildlife and contributes to the area's biodiversity, providing habitats for various species of fish and birds.