The Thiou River is a small river located in the Haute-Savoie region of southeastern France. It flows through the city of Annecy and is known for its clear waters and picturesque surroundings. The river is approximately 3.5 kilometers long and connects Lake Annecy to the Fier River. The Thiou River is significant for its role in the local ecosystem and as a recreational area. It is popular for activities such as kayaking and fishing, attracting both locals and tourists. The river's banks are lined with charming pathways, making it a pleasant spot for walking and enjoying nature.