The Ballyfinboy River rises close to Moneygall in County Offaly, Ireland and flows in a generally northwesterly direction into Lough Derg at Drominagh. It forms part of the boundary between County Tipperary and County Offaly.[1] The river flows through the towns of Cloughjordan and Borrisokane west of which it flows past Ballyfinboy Castle, a ruined tower house with a Sheela na gig in the townland of Ballyfinboy.