sentences:  According to the 2010 census, the county has an area of , of which (or 98.34%) is land and (or 1.66%) is water.The White River flows through the county where it is joined by Eagle Creek and Fall Creek, both of which have dams in the county forming Eagle Creek Reservoir and Geist Reservoir, respectively.Marion County has two Indiana State Parks, Fort Harrison State Park and White River State Park, as well as many municipal parks.