Geography fail

Geography fail:
Aunt B: What river is that?
me: Uhhhh... Patuxent?
Big Frog: Potomac.
me: Potomac! (sees sign) Shenandoah!
Big Frog: Shenandoah?
me: I long to see you. Away, you rolling river.

Later within the same trip:
I posted to FB as we entered the different states.  As we entered West Virginia, we got a response of
friend: "Get off the highway and enjoy the country roads. They are good enough to sing about."
me (quoting Dave Berry); Almost heaven? West Virginia?!? 
(and we realize) Blue Ridge Mountains, Shenandoah River.
Yup. We shoulda known that one.