 The Greese flows south-southwest, crossing under the M9, through Kilkea Golf Club and past Kilkea Castle, passing under the Dublin–Waterford railway line at Newtownpilsworth/Dunmanoge and draining into the River Barrow in the Jerusalem townland, Painestown downstream of Maganey Lock (this last stretch forms part of the County Carlow/Kildare border).Fish include brown trout.stone loach, Atlantic salmon, European eel, three-spined stickleback and European river lamprey.