Honeymoon.

Charlotte and Arthur travelled along the banks of the Shannon and Lough Derg to Limerick.

Limerick

Limerick is the third largest city in the Republic of Ireland, and the principal city of County Limerick and Ireland's Mid-West Region.

Lough Derg (from Irish: Loch Deirgeirt meaning "loch of the red eye") is the third-largest lake (or lough) in Ireland (after Lough Neagh and Lough Corrib) and the second-largest in the Republic of Ireland.

http://en.wikipedia.org/wiki/Lough_Derg_(Shannon)

http://en.wikipedia.org/wiki/Limerick

http://www.limerick.ie/media/charlotte%20bronte's%20kilkee.pdf