The northwestern region of Ohio is defined by agriculture and completely flat Lake Plains. The region is bordered by Indiana, Michigan, and Lake Erie. The Great Black Swamp, a historical wetland, once covered much of the area. The largest city in Northwest Ohio is Toledo. There are 8 natural lakes, 20 artificial lakes, 58 islands, 13 state parks, and 1 state forest in the area.
The northeastern region of Ohio is a patchwork of cities, forests, hills, and fields. The region is bordered by Pennsylvania and Lake Erie. The largest city in Northeast Ohio is Cleveland. There are 59 natural lakes, 45 artificial lakes, 7 inland islands, 1 National Park, 18 state parks, 5 state forests within the area.
The central region of Ohio is characterized by a flat topography and a large metropolitan area. The region is bordered by Ohio's other regions. The largest city in Central Ohio is Columbus, which is also the state capital. There are 22 natural lakes, 12 artificial lakes, 46 inland islands and 9 state parks within the area.
The southwestern region of Ohio can be identified by its many rivers and cities. The region is bordered by Kentucky and Indiana. The largest city in Southwest Ohio is Cincinnati. There are 17 artificial lakes, 5 inland islands, 19 state parks, and 3 state forests within the area.
The southeastern region of Ohio features forested and hilly landscapes. The region is bordered by Kentucky and West Virginia. The largest city in Southeast Ohio is Athens. There are 1 natural lake, 26 artificial lakes, 12 inland islands, 23 state parks, 1 National Forest, and 16 state forests within the area.