The two rivers that form the Ohio River are the Alleghenyand Monongahela rivers.
Two rivers that join the Mississippi River are the Missouri River and the Ohio River.
The two rivers that form the northern border of North Korea are the Yalu River and the Tumen River.
The Allegheny and Monogahela rivers joinb at Pittsburgh to form the Ohio River.
The Republican and Smoky Hill rivers join at Junction City, Kansas to form the Kansas River.
Two rivers partially form Illinois State's Eastern boundary. The Wabash River is one river that forms Illinois' boundary. The Ohio River is the other river that forms the state's boundary.
rio grande
The Yalu River and the Tumen River form the northern border of North Korea.
The Monongahala River (i'm not quite sure i spelled that right), and the Allegheny River
The Ganges river was formed when the two rivers - Bhagirathi and Rudraprayag met at Devprayag to form the main River.
The Monongahela River, and Allegheny River points meet to form the Ohio River.
Mesopotamia