The River Deel near Newcastlewest is a charming and historically rich waterway flowing through County Limerick in the west of Ireland. Rising near Dromina in north County Cork, the river travels northward for over 60 kilometres before entering the Shannon Estuary at Askeaton. Along its course, it passes through Milford, Belville Bridge, Castlemahon (Mahoonagh), Newcastle West — running roughly parallel to the main N21 Limerick-Killarney road — and on through Rathkeale before reaching its estuary confluence. The river's very name reflects its character: derived from the Irish word daol, meaning beetle, insect, or worm, a reference to the river's winding, sinuous course through the Limerick countryside. This is a classic Irish lowland river offering trout fishing in a pastoral, agricultural landscape.