Robin Morton (once? of the Boys of the Lough) gives the following in his book "Folksongs sung in Ulster":
"Dobbins Flowery Vale is a part of what was the estate of Colonel Dobbin, on the edge of the city of Armagh. Colonel Dobbin was Member of Parliament for the area in the late 18th century....The Vale is still there , very much as it must have been years ago."
Morton was writng nearly thirty years ago - I have a suspicion the area is now a housing estate!
Regards
p.s. "My Lovely Irish Maid" sounds as though it might be "The Bonny Irish Maid" - which is in the DT.