Ohio River course forms the northern borders of West Virginia and Kentucky; and the southern borders of Ohio, Indiana and Illinois, until it joins the Mississippi River at the city of Cairo, Illinois. Where the Ohio joins the Mississippi is the lowest elevation in the state of Illinois, at . The Ohio River, which flows 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. Measured by long-term mean discharge in cubic feet per second and cubic meters per second,
Muddy River (Nevada) By 1855 it had become a cold season freight route between Utah and Southern California that remained in use in Southern Nevada into the 20th century. Mormon settlers established several settlements in the Muddy River area in 1864, including the town of St. Thomas, which by 1938 was submerged under Lake Mead until recently. Some of the towns ruins can be still seen during low water levels. Some Paiutes fought to protect and reclaim their homeland. For a variety of reasons, including the harsh climate, unpredictable periods of drought, and a tax dispute with the State of Nevada, the Mormons