Irish Hills is an area of land located roughly in southeastern Jackson County and northwest Lenawee County in Southeast Michigan. It was named after the numerous Irish immigrants who settled there from 1830 until 1850. Today it is known throughout the state for its scenery, especially in the summer. Its hills and larger kettle lakes surround the 654-acre (2.65 km2) Hayes State Park. It is also known for its chain of smaller kettle lakes bordered by US Highway 12. These link to Cambridge Junction Historic State Park, which is adjoined by the Michigan International Speedway.