This is a massive ringfort. The banks are at least 4m high and the ditch on the south side is 4m wide and 3m deep. As I was unable to enter the field - a rickety gate and a (probably bogus) beware of the bull' sign put me off - I can't say what the measurements are exactly, but it's at least 70m in diamater.
There's a bit of recent history to this site, too. In October 1843 Daniel O'Connell held a repeal meeting here.
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_A Random Selection of Nearby Monuments
 Ballymacgibbon (Co. Mayo) |  Carrownalurgan (Co. Mayo) |  Realtoge (Co. Meath) |
 Tornant Lower (Co. Wicklow) |  Brian Boru's Fort (Co. Clare) |  Mound Of Down (Co. Down) |
