Coomnahorna is one of the summits of the Dunkerrons, the elongated mountain area that stretches down the south side of the Iveragh peninsula. It is a place of wild land with great ridges to nearby summits. The terrain is often extremely rough. There are no roads, no paths and little activity except sheep farming.

From the SW start at V66519 66641 A which is part of the Kerry Way. The easiest route is probably to use forest tracks to around V655 691 B and then head up the ridge to the west to the top.

From the West it is possible to park along the road north of Lough Iskanamacteery for example at V6024 6990 C. There is a rough track to start with. Avoid farm buildings and land.

Hazards of this area include rough confusing terrain in places making walking progress slow. Lough Slievenashaska to the NE of the summit cannot be got round as its walls drop straight into the water. The stream leaving this lough can become uncrossable after rain.

The summit has fine views over the Kenmare River and the surrounding ground. Linkback: https://mountainviews.ie/summit/294/comment/5054/