where is the ohio river located on the us map
Ohio River 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);[2] Mississippi at Thebes: 208,200 cu ft/s (5,897 m3/s)[3]) and, thus, is hydrologically the main stream of the whole river system.
Allegheny River The Allegheny River (/ˌæləˈɡeɪni/ AL-ə-GAY-nee) is a principal tributary of the Ohio River; it is located in the Eastern United States. The Allegheny River joins with the Monongahela River to form the Ohio River at the "Point" of Point State Park in Downtown Pittsburgh, Pennsylvania. The Allegheny River is, by volume, the main headstream of the Ohio River.
Mahoning River The Mahoning River is a river located in eastern Ohio and western Pennsylvania. Flowing primarily through several Ohio counties, it joins the Shenango River to form the Beaver River and is part of the Ohio River watershed.
Euphrates The Euphrates (/