Pittsburgh. It's called a confluence. It is now the site of Point State Park.
The confluence of the Alleghaney and Monogahela Rivers form the Ohio River at Point State Park in Pittsburgh. Thus the three rivers that "come together" at that point are the Ohio, Allegahaney and Monogahela.
The river is formed by the confluence of the Allegheny and Monongahela rivers at Point State Park (called the "Point") in Pittsburgh, Pennsylvania. It joins the Mississippi River at Cairo, Illinois. The native Americans considered the Monongahela to be the same as the Ohio and the Allegheny as a branch.
There is a Monongahela River and the Monongahela National Forest in the state of West Virginia.
"Evolve" is not exactly the right word. "Originate" is more accurate. Anyway, the Ohio river originates in Pittsburgh, PA, where the Allegheny and Monongahela ("the Mon") rivers meet to form the Ohio river. The wedge of land between the Allegheny and Monongahela rivers is called "The Point", and is now Point State Park.
The river is formed by the confluence of the Allegheny and Monongahela rivers at Point State Park (called the "Point") in Pittsburgh, Pennsylvania. It joins the Mississippi River at Cairo, Illinois. The native Americans considered the Monongahela to be the same as the Ohio and the Allegheny as a branch.
The major rivers in Pennsylvania are Allegheny River, The Ohio River, and The Potomac River.
There are an estimated 18 rivers that are in the state of Florida. A few of the rivers are San Sebastian river, Stranahan river, and Salt Springs river.
The river is formed by the confluence of the Allegheny and Monongahela rivers at Point State Park (called the "Point") in Pittsburgh, Pennsylvania. It joins the Mississippi River at Cairo, Illinois. The native Americans considered the Monongahela to be the same as the Ohio and the Allegheny as a branch.
The major rivers in Wisconsin are the Wisconsin River, Mississippi River, St. Croix River and Chippewa River.
There are no states that have no rivers. Several states have no major rivers. Hawaii's longest river is just 33 miles in length.
The major rivers in New York State are the Saint Lawrence River, Mohawk River, Oswegatchie River, Black River, Ausable River, and Chenango River.