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Feature count in area: 24, all in Donegal,
OSI/LPS Maps: 10
Highest Place: Slieve League 596.4m
Starting Places (1) in area Donegal SW:
Port Pier
Summits & other features in area Donegal SW:
Maum 325m
N: Sliabh Tuaidh: Tormore Island South 94m, Tormore Island North 139m, Crockuna 400m, Slievetooey 511m, Slievetooey Far West Top 460m, Slievetooey West Top 472m
NE: Glengesh: Balbane Hill 472m, Glengesh Hill 390m, Common Mountain 499.7m, Crocknapeast 497m, Croaghavehy 372m, Mulmosog Mountain 351m, Mulnanaff 475m
NW: Glencolmkille: Croaghacullion 374m, Croaghloughdivna 310m
S: Killybegs Hills: Croaghacullin 405m, Croaghmuckros 275m, Crownarad 493m, Crownarad SW Top 471m
SW: Slieve League: Crockrawer 435.2m, Leahan 427m, Slieve League 596.4m, Slieve League SE Top 576.7m
Note: this list of places may include island features such as summits, but not islands as such.
Highest Place: Slieve League 596.4m
Starting Places (1) in area Donegal SW:
Port PierSummits & other features in area Donegal SW:
Maum 325m
N: Sliabh Tuaidh: Tormore Island South 94m, Tormore Island North 139m, Crockuna 400m, Slievetooey 511m, Slievetooey Far West Top 460m, Slievetooey West Top 472m
NE: Glengesh: Balbane Hill 472m, Glengesh Hill 390m, Common Mountain 499.7m, Crocknapeast 497m, Croaghavehy 372m, Mulmosog Mountain 351m, Mulnanaff 475m
NW: Glencolmkille: Croaghacullion 374m, Croaghloughdivna 310m
S: Killybegs Hills: Croaghacullin 405m, Croaghmuckros 275m, Crownarad 493m, Crownarad SW Top 471m
SW: Slieve League: Crockrawer 435.2m, Leahan 427m, Slieve League 596.4m, Slieve League SE Top 576.7m
Note: this list of places may include island features such as summits, but not islands as such.
Place Rating ..
Grid Reference G62860 88040, OS 1:50k mapsheet 10
Place visited by: 31 members, recently by: Colin Murphy, markmjcampion, eamonoc, annem, LorraineG60, noucamp, melohara, MichaelG55, paulbrown, Fergalh, hgboyle, shaunkelly, groe, Wilderness, simoburn
I visited this place: NO
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Bedrock type: Flaggy quartzite and dark schist, (Slieve League Formation)
Notes on name: The Irish form Cnoc Onna can be inferred from Lag Onna on the Discovery map.
Short or GPS IDs, 6 char: Crckn, 10 char: Crockuna
Linkback: https://mountainviews.ie/summit/834/
Gallery for Crockuna (Cnoc Onna) and surrounds
Summary
for Crockuna (Cnoc Onna):
Pretty easy but rewarding Carn
Summary created by Colin Murphy
14 Jun, 2024
Walk SW to B (G63975 88685) to access Sli Cholmcille and follow Sli Cholmcille to a stile at C (G630 886). Cross fence and head directly south up the gently rising slope – mostly grass, short heather and large areas of scree, but easy terrain generally. Summit is marked by a cairn next to a fence. Fine views in all directions.
Add a Place Comment for Crockuna, Cnoc Onna 
In footsteps of St Colmcille
by gerrym
2 Sep 2020
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: mountainviews.ie/summit/834/comment/6666/
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: mountainviews.ie/summit/834/comment/6666/
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Crockuna via the Sli Cholmcille
by noucamp
2 Sep 2020
Parking available at A (G640 887) near McMonigle Stoneworks.
Walk SW to B (G63975 88685) to access Sli Cholmcille and follow Sli Cholmcille to a stile at C (G630 886). The Yellow Man waymarker posts are not too plentiful but provided it's not very misty it should be possible to see and pick out the route as it ascends the flank of Crockuna. After crossing the stile at C (G630 886) Sli Cholmcille begins to descend at around D (G628 884), 360m so head directly uphill (South) to the summit. If you are fortunate to have good visibility, you will be able to see as far south as Ben Bulben and the Ox Mountains. Views North are also impressive. Round trip of 4 kms with 220m ascent. Linkback: mountainviews.ie/summit/834/comment/20870/
Walk SW to B (G63975 88685) to access Sli Cholmcille and follow Sli Cholmcille to a stile at C (G630 886). The Yellow Man waymarker posts are not too plentiful but provided it's not very misty it should be possible to see and pick out the route as it ascends the flank of Crockuna. After crossing the stile at C (G630 886) Sli Cholmcille begins to descend at around D (G628 884), 360m so head directly uphill (South) to the summit. If you are fortunate to have good visibility, you will be able to see as far south as Ben Bulben and the Ox Mountains. Views North are also impressive. Round trip of 4 kms with 220m ascent. Linkback: mountainviews.ie/summit/834/comment/20870/
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British summit data courtesy:
Database of British & Irish Hills
Database of British & Irish Hills