What does Lough Erin Shore mean?

It's a song by The Corrs.

Lough Erin is the largest lake in Ireland.
The tune is to Francie Mooney's Gleanntainn Ghlas Ghaoth Dobhair

There is no Lough Erin in Ireland - Erin is a romantic name for the country of Ireland . There is a large lake in the north of Ireland called Lough Erne . People sometimes confuse the two names . The tune "Lough Erin" is sometimes called "Erin's Shore".