The River Tryweryn is a river located in Wales, flowing through the picturesque landscape of the Snowdonia National Park. It is approximately 20 kilometers long and is known for its scenic beauty and diverse wildlife. The river is a tributary of the River Dee, contributing to the region's rich ecosystem. The Tryweryn is also famous for its white-water rafting and kayaking opportunities, attracting adventure enthusiasts from around the world. The river's flow is regulated by the Tryweryn Reservoir, which was created in the 1960s to supply water to the city of Liverpool. This reservoir plays a crucial role in managing the river's water levels.