Songs in a theme

Playing the other day got me to thinking of a game. How many songs can you come up with that have a similar word in them?

I was working on: Mountain Tay, These Are My Mountains, At the Foot of Yonder Mountain and The Rolling Hills of the Border.

So how many songs can you come up with that have one or the other of those two geological features in them. When you can't name any songs with one or the other, give a song that has some other geological feature. Once we begin to run out of geological features, we can start on another theme.

This is a way to build a list of songs that we may discover titles that are unknown to us and expand our repertoires.