Knocknahillion is one of the Maumturk Mountains of Connemara in County Galway, Ireland. At 607 m, it is the 210th–highest peak in Ireland on the Arderin list, and 256th–highest on the Vandeleur-Lynam list. Knocknahillion is in the middle sector of the long north-west to the south-east spine of the Maumturks.Wikipedia