The River Gwili is a river located in Wales, flowing through the picturesque landscape of Carmarthenshire. It is a tributary of the River Towy and stretches approximately 20 kilometers. The river is known for its scenic beauty, with lush greenery and diverse wildlife along its banks. The River Gwili is popular for various recreational activities, including fishing and walking. The Gwili Railway, a heritage railway, runs alongside part of the river, offering visitors a chance to enjoy the natural surroundings while experiencing a piece of local history.