Browse Map

Explore away

Explore Map Collection

Check out our basemaps

Print a Map Plus

Generate a high-quality PDF

Field Guide

Discover local flora, fauna, geology, and more

Local Flora & Fauna

Learn the ecology of your area

Local Geology

Learn the geologic formation at your feet

Get Started or Sign In

Welcome

Continue with Apple

Already have an account? Sign In

Measure

Topo

Ecoregions

Public Lands

...

BASEMAPS

Default Weather

Temperature

Smoke

...

WEATHER

Ohio River

River on Cumberland Plateau, Appalachian Mountains, Ohio River Islands National Wildlife Refuge, Allegheny Plateau in Paducah in MO, KY, IL, IN, OH

Missouri Fishing Regulations

Kentucky Fishing Regulations

Illinois Fishing Regulations

Indiana Fishing Regulations

Ohio Fishing Regulations

Print Map

Generate High-Quality PDF

Length

974mi

On the Web

On Wikipedia

The Ohio River, which streams westward from Pittsburgh, Pennsylvania, to Cairo, Illinois, is the largest tributary, by volume, of the Mississippi River in the United States. At the confluence, the Ohio is considerably bigger than the Mississippi (Ohio at Cairo: 281,500 cu ft/s (7,960 m3/s); Mississippi at Thebes: 208,200 cu ft/s (5,897 m3/s)) and, thus, is hydrologically the main stream of the whole river system, in no small part because its flow includes the mountain stream-fed tributaries along both banks of the Monongahela River and the Allegheny River as well as the tributaries of the Ohio itself. The 981-mile (1,579 km) river flows through or along the border of six states, and its drainage basin includes parts of 15 states. Through its largest tributary, the Tennessee River, the…

Read More on Wikipedia