According to the United States Census Bureau, the city has a total area of , of which is land and is water. The lowest point in the state of Iowa is , located to the immediate south-west of Keokuk where the confluence of the Des Moines and Mississippi Rivers creates a tripoint between Iowa, Illinois and Missouri.
According to the United States Census Bureau, the city has a total. area of , of which is land and is water The lowest point in the state of Iowa is , located to the immediate south-west of Keokuk where the confluence of the Des Moines and Mississippi Rivers creates a tripoint between Iowa, Illinois and Missouri.