After it rises it passes the flowing areas, first Milford and down towards Belville bridge, then on to Castlemahon (Mahoonagh) and nearby Newcastle West, running parallel to the main Limerick-Killarney N21 road, to reach Rathkeale.

The Deel derives its name from daol, an Irish word for a beetle, insect or worm, because of its winding, bending shape.

The Deel was once a good salmon and grilse fishery but now is mainly fished for brown trout.

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