sentences:  Although the activists lost and the steel mill and port were constructed, the U.S. Congress created the Indiana Dunes National Lakeshore in 1966 to protect the area's unique natural habitat.According to the 2010 census, the county has an area of , of which (or 80.14%) is land and (or 19.86%) is water, most of it in Lake Michigan.The highest point, at , is in northeastern Jackson Township near County Road East 950 North and County Line Road.