The River Sió is a small river located in Hungary. It flows through the Vas and Zala counties, eventually joining the River Zala. The river is approximately 50 kilometers long and is known for its scenic beauty and natural surroundings. The Sió River is an important part of the local ecosystem, supporting various wildlife and plant species. It also plays a role in agriculture, providing irrigation to nearby fields. The river is popular for recreational activities such as fishing and hiking along its banks, attracting both locals and tourists.