 The Northern Indiana landscape is physically characterized by very flat to very rolling terrain, ranging from 600 to 1,000 feet (180 to 300 m) above sea level.Glacial kettle lakes are found throughout Northeast Indiana, with sand dunes sharing the Lake Michigan shoreline with heavy industry in the northwest.Kosciusko County is home to the largest natural lake (Wawasee) and deepest natural lake (Tippecanoe) in the state of Indiana.