Which state borders the Great Lakes?

Ohio is one of the states that borders the Great Lakes. Specifically, it has a significant shoreline along Lake Erie, which is one of the five Great Lakes. The Great Lakes, comprising Lakes Superior, Michigan, Huron, Erie, and Ontario, play a crucial role in commerce, recreation, and the environment in the surrounding states.

The other states mentioned do not have a direct shoreline on the Great Lakes. South Dakota is located further west and does not have any coastline related to the lakes. Indiana does have a small section of shoreline on Lake Michigan but is often overshadowed in this context by Ohio's larger geographical connection with Lake Erie. Iowa is entirely landlocked and, therefore, has no borders with any of the Great Lakes. Thus, Ohio is the definitive answer as it has both direct access to and significant interaction with the Great Lakes.