Diamond Hill or Bengooria (Irish: Binn Ghuaire, meaning 'Guaire's peak') is an isolated peak overlooking the village of Letterfrack, in the northwest corner of the Twelve Bens in Connemara National Park in County Galway, Ireland. At only 442 metres (1,450 ft), it does not rank as an Arderin, or a Vandeleur-Lynam; however, it has the prominence to rank as a Marilyn.