No, Indiana is between them.
Neither. Ohio shares a border with both of them.
ohio does
Michigan shares a land border with Ohio, Indiana and Wisconsin, and a water border with Illinois, Minnesota, and the Canadian Province of Ontario. The state capital cities are Columbus, Ohio; Indianapolis, Indiana; Madison, Wisconsin; Springfield, Illinois; and Saint Paul, Minnesota.
Both Indiana and Ohio boarder the southern line of Michigan's Lower Peninsula, while the state of Wisconsin shares a border just below Michigan's Upper Peninsula.
Michigan shares a land border with Ohio, Indiana and Wisconsin, and a water border with Illinois, Minnesota, and the Canadian Province of Ontario. The state capital cities are Columbus, Ohio; Indianapolis, Indiana; Madison, Wisconsin; Springfield, Illinois; and Saint Paul, Minnesota.
Ohio
The southern border of Ohio is 981 miles and is defined by the Ohio River. It is also the southern border of Indiana and Illinois.
wabash
Michigan shares borders with Ohio and Indiana to the south. And Wisconsin, as the Upper Peninsula borders it up north. (There are water borders within the Great lakes with Illinois and Minnesota.)
The Mississippi River forms the wavy western border of Illinois. And the Ohio Wabash River is the southern border of Illinois.
The Wabash River forms the easter border of Illinois. I've noticed that the previous answer was the Ohio River. The Ohio River actually is what runs along the southern tip of Illinois.
Ohio River