I don't know the song, but i kmow the area.
As Noreen said, "North Cork through Formine(?), be all down by the sea"
"North Cork through Fermoy, by Youghal* down by the sea."
* Pronounced somewhere between "yawl" and "y'all"
"plow the golden veil(?)"
"Golden Vale" (Vale = valley)
The Golden Vale is a particularly fertile area covering parts of Cork, Tipp. & Limerick. IMHO, the writer is stretching things to bring it quite as far South as the Blackwater, but I guess that's poetic licence