Mad River is a river located in the state of Ohio, flowing through Mad River Township and eventually joining the Great Miami River. It is approximately 50 miles long and is known for its scenic beauty and recreational opportunities, including fishing and kayaking. The river's watershed supports various wildlife and plant species, contributing to the local ecosystem. The surrounding areas offer parks and trails, making it a popular destination for outdoor enthusiasts. Additionally, the river plays a role in the region's history and development, serving as a natural resource for communities along its banks.