Thanks, Reinhard. It's good to know I didn't make a foolish mistake.
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When I was a fifth-grader, ten years old, I studied American geography in school. Somehow the names of Pennsylvania's rivers caught my attention. Who can forget that in Pittsburgh, the Allegheny and the Monongehela join the Ohio? Just upstream is one I never heard of, the Youghiogheny. (I don't even know how to pronounce that.)

The Susquehanna is to the east of these, in the central and eastern part of the state. Don't ask me why the West Branch, which is plenty big, doesn't have a name of it's own. The Susquehanna is an odd-shaped river. The closest it comes to the Delaware is about 40 miles, so don't let the song make you think those rivers connect.

Just for fun, here's a list of PA rivers:

Allegheny River, Beaver River, Clarion River, Conemaugh River, Conewago Creek, Conodoguinet Creek, Delaware River, French Creek, Juniata River, Lackawanna River, Lackawaxen River, Lehigh River, Loyalsock Creek, Mahoning Creek, Monongahela River, Ohio River, Penns Creek, Pine Creek, Raystown Branch Juniata River, Redbank Creek, Schuylkill River, Susquehanna River, Swatara Creek, West Branch Susquehanna River and Youghiogheny River.

The Appalachians (the Valley and Ridge) are an important feature in Pennsylvania.