The Ilm River is a river located in central Germany, primarily flowing through the state of Thuringia. It is approximately 91 kilometers long and is a tributary of the Saale River. The river's source is near the town of Ilmenau, and it flows northward, passing through several towns and picturesque landscapes. The Ilm River is known for its scenic beauty and recreational opportunities, including hiking and cycling along its banks. The river also plays a role in local ecology, supporting various plant and animal species. Its waters are important for the surrounding communities, providing resources for agriculture and tourism.