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is a city in the U.S. state of Michigan. The city lies mostly within Eaton County, though a small portion extends into Clinton County, and sits above the Grand River 12.7 miles (20.4 kilometers) directly west of downtown Lansing. The population was 7,813 at the 2000 census. The city is well-known for,and named for, its 300-million-year-old, sandstone and quartzite rock ledges that rise above the Grand River and are used by recreational rock climbers.
According to the United States Census Bureau, the city has a total area of 3.6 square miles (9.4 km²), of which, 3.5 square miles (9.2 km²) of it is land and 0.1 square miles (0.2 km²) of it (2.20%) is water.