I don't really know "My Lagan flows softly", but I can correct the placenames:

"MY LAGAN FLOWS SOFTLY - This is NOT the same as "Lagan Love." Sung by Tara Folk.
Chorus: My Lagan, she flows softly from Slieve Croob down to the sea
Through Dromore and Dromara then close to Aghalee
From Lisburn down to Hilden, Lambeg then Shaw's Bridge
To Belfast's salty waters where her lonesome journey ends."