Castlerea (Irish: An Caisleán Riabhach, meaning "brindled castle") is located in the west of County Roscommon, Ireland. It is the second largest town in the county with a population of 3,055 (as of 2011). Roughly translated from Irish, Castlerea can mean Brindled Castle (Caisleán Riabhach) or King's Castle (Caisleán Rí). The town is built on the River Suck and the River Francis, both tributaries of the River Shannon.