> This also means that the Appalachians have some of the oldest rivers In the case of the New River (unsure about the others), it is the other way around: the

> This also means that the Appalachians have some of the oldest rivers In the case of the New River (unsure about the others), it is the other way around: the river is not old because the mountains are old, but the mountains are old because the river is older. The New River predates the mountains that surround it.