Ohio is a Midwestern state in the Great Lakes region of the United States. The state takes its name from the Ohio River, whose name in turn originated from the Seneca word ohiːyo', meaning "good river", "great river" or "large creek". The Ohio River forms its southern border, though nearly all of the river itself belongs to Kentucky and West Virginia. Significant rivers within the state include the Cuyahoga River, Great Miami River, Maumee River, Muskingum River, and Scioto River. The rivers in the northern part of the state drain into the northern Atlantic Ocean via Lake Erie and the St. Lawrence River, and the rivers in the southern part of the state drain into the Gulf of Mexico via the Ohio River and then the Mississippi. The worst weather disaster in Ohio history occurred along the Great Miami River in 1913. Known as the Great Dayton Flood, the entire Miami River watershed flooded, including the downtown business district of Dayton. As a result, the Miami Conservancy District was created as the first major flood plain engineering project in Ohio and the United States.

Alphabetically

By tributary

Lake Erie

Ottawa River

Maumee River

Toussaint River (Ohio)

Portage River (Ohio)

Sandusky River

Huron River

Vermilion River

Black River

Rocky River

Cuyahoga River

Tinkers Creek

Brandywine Creek

Doan Brook

Euclid Creek

Chagrin River

Marsh Creek

Grand River

Ashtabula River

Conneaut Creek

Ohio River

Wabash River

Great Miami River

Mill Creek

Little Miami River

Fivemile Creek

Whiteoak Creek

Eagle Creek

Ohio Brush Creek

Scioto River

Little Scioto River (tributary of Ohio River tributary)

Pine Creek

Symmes Creek

Raccoon Creek

Leading Creek

Shade River

Hocking River

Little Hocking River

Muskingum River

Meigs Creek

Licking River

Wakatomika Creek

Wills Creek

Tuscarawas River

Walhonding River

Kokosing River

Mohican River

Duck Creek

Little Muskingum River

Sheets Run

Opossum Creek

Sunfish Creek

Captina Creek

McMahon Creek

Wheeling Creek

Short Creek

Cross Creek

Yellow Creek

Little Beaver Creek

Mahoning River

Shenango River