HiIt is an actual place, just south of the border and SW of Cavan. There's another song to the smae tune called "The little white house." I think it was mentioned here on a thread before.
Percy French wrote some good stuff. He came from Newcastle Co. Down, which as we all know (??) is where the Mountains of Mourne sweep down to the sea. Hence his most famous song.
My favourite would probably be "Eileen Oge".
Slainte
Alison