On my travels Cnoc Onna was reached after walking 15 miles from Gleann Cholm Cille along some of the most glorious and remote coastline in Ireland (Walk 111). There is an easier option though, taking in the neighbouring heights of Sliabh Tuaidh.

A scenic drive along Loughros Beg Bay brings the small collection of houses at Maghera. The walker is well catered for with ample parking for a small and deserved charge. Walk along the road into the steeply sided valley and begin to climb the terraced slopes of Sliabh Tuaidh. With height stunning views bloom over coast and hill, as a fenceline and rough path soar above the pounding surf in the Bay. Lough Acruppan is reached and is followed by steep ground to eventually reach the summit area and trig point in a couple of hours. Options here to further explore the western tops

Views are stunning and Cnoc Onna below barely gets a look in I'm afraid, but it is part of a good walk so no more putting it down! Descend S over mostly good ground with a fenceline to aid navagation to reach the col. There is an area which is a bit of a jigsaw puzzle of peat hags but rise up through to reach the 85 km Sli Cholmcille waymarked walk as it passes through the col with yellow topped maker posts. A stile aids crossing of a lofty fence and an ascent over stoney ground brings the small summit cairn.

Views are impressive - down the valley to the sands at Maghera over Lough Nalughraman held aloft before the hills drop 1000 ft to Loughros Beg Bay, beyond to the Derryveagh Mtns and Atlantic coast. S brings the less attractive side of Slieve League and the mountains of Sligo, with views W dominated by the bulk of Sliabh Tuaidh.

Return to the Sli Cholmcille and follow it down into the valley and the quiet road back to Maghera, alongside the Owenwee river. Beautiful views all the way as height is lost from below and towers above.

This is a stunning part of the country and has limitless options for walking and exploring and has that special quality to walking on high with the coast nearby. Not a great hill on its own but when you have great neighbours it is very inviting!! Linkback: https://mountainviews.ie/summit/834/comment/6666/