Ram Island (Antrim), scanty remains; said to have been used as a sepulchre.
Rath (Clare), site only.
Rathmichael (Dublin), stump only.
*Rattoo (Kerry), very perfect; the loftiest and least injured by renovation.
Roscom (Galway), three miles east of Galway. Imperfect.
Roscrea (Tipperary), imperfect, curiously sculptured rounded doorway.
Rosenallis (Meath?), site only; the subject of a bitter controversy (v. Petrie, pp. 40-42).
Rosscarbery (Cork), site only.
*Scattery Island (see Inis Scattery), 125 feet high by 52 feet round. The only specimen having doorway level with the ground.