The Youghiogheny river (pronounced yock-a-gainy or yak-a-gainy, by locals, aka The Mighty Yock") runs flat and wide in western Pennsylvania. It is one of the three rivers that make up the Pittsburgh area (the other two are the Monongahela and the Allegheny, which merge with the yock to make the Ohio).
It is a fast running river in places and excellent for white water rafting or fishing. It is a part of the Mississippi River watershed that stretches from the western slope of the Appalachian Mountains in the east to the Rockies in the west.
It was vital during the early days of industry in America for shipping coal and logs to the steel refineries in Pittsburgh. Now it's a great river to walk, run or bike along.
A section of the river in Maryland is notable for running north.