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North Mayo Area , S: Bangor Erris Hills Subarea
Feature count in area: 19, all in Mayo, OSI/LPS Maps: 22, 23, EW-WNN
Highest Place: Maumakeogh 379m

Starting Places (9) in area North Mayo:
Bangor Trail Head, Carnhill, Carrowmore Wood, Erris Head, Portacloy Bay, Proesoon, Sralagagh West, Termon Hill Road, Tower Hill South

Summits & other features in area North Mayo:
Cen: Pulathomas: Barnacuillew 260m
E: Ballycastle Hills: Knockaghaleague 237m, Knockboha 186m, Maumakeogh 379m
N: Benwee Head Cliffs: Benwee Head 255m, Barradeegin 229m, Glinsk 304m, Illanmaster 238m, Illanmaster Island 105m, Porturlin Hill 155m, Srahataggle 182m, Tawnaghmore 340m
S: Bangor Erris Hills: Carrafull 269m, Knocklettercuss 370m, Knocknascollop NW Top 244m, Sheean 295m, Slieve Fyagh 335m
W: Belmullet: Aghaglasheen 132m, Termon Hill 103m

Note: this list of places may include island features such as summits, but not islands as such.
Rating graphic.
Knocklettercuss, 370m Hill Leitir Cois A name in Irish,
Place Rating ..
(Ir. Leitir Cois [amended from OSNB], 'wet hillside of the
river-bank')
, Crooklettercuss, Cruach Leitir Cos, Mayo County in Connacht province, in Binnion Lists, Knocklettercuss is the second highest hill in the North Mayo area and the 1018th highest in Ireland.
Grid Reference F87598 19814, OS 1:50k mapsheet 23
Place visited by: 38 members, recently by: learykid, bryanjbarry, markwallace, Geo, jlk, gerrym, ryanguinness10, annem, Wilderness, Lauranna, eamonoc, Oileanach, Fergalh, hivisibility, Ulsterpooka
I visited this place: NO (You need to be a logged-in member for this.)
Longitude: -9.719554, Latitude: 54.115107, Easting: 87598, Northing: 319814, Prominence: 212m,  Isolation: 2.4km, Has trig pillar
ITM: 487575 819816
Bedrock type: Banded, graded and X-bedded quartzites., (Bangor/Corslieve Formation)
Notes on name: The Ordnance Survey Name Book gives Leitir Cos as the derivation of this name, which it interprets as 'spewy hillside of the foot'. Leitir Cos appears to be an error for Leitir Cois.
  Short or GPS IDs, 6 char: Knc370, 10 char: Knckltrcs

Linkback: https://mountainviews.ie/summit/878/
Gallery for Knocklettercuss (Leitir Cois) and surrounds
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Member Comments for Knocklettercuss (Leitir Cois)
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            MountainViews.ie picture about Knocklettercuss (<em>Leitir Cois</em>)
Picture: View south from Knocklettercuss
A grand viewpoint into the Wild Nephin National Park
by gerrym 13 Mar 2023
Bangor Erris gives easy access to Knocklettercuss and there is parking for hundreds at the GAA pitch which it literally a few steps from the start of the Bangor Trail. Thankfully its wetness is only followed for a short distance before climbing the slopes.

Even at this modest height views north are stunning, past the working quarry face on Carrafull to the North Mayo hills and cliffs and the waters of Broadhaven Bay. To the west a vast peatland carries the eye to the Atlantic and the iconic mountain shapes on Achill. As the 3 km summit ridge is reached the towering wind turbines to the east dwarf conifer plantations as they produce electricity for hundreds of thousands of households.

The walk to the summit is fairly relaxed with the landscape east and west constantly drawing attention. This hill keeps the views south as an enticement and when they finally appear they are worth the wait. The big mountains of the Nephin Begs rise splendidly out of further vast tracts of bog land with the long line of Slieve Carr dominant. Further south the jagged line from Corranabinnia to Glennamong creates a grand barrier. A cairn is passed on the way to the summit trig pillar. On a good day these views would be more than worth the effort. Today a brisk and cold easterly wind told me to keep moving.

As others have said an out and back return can be made to maintain the height or it would be handy enough to drop down west to pick up the Bangor Trail. I continued south with an approach to Slieve Carr as a focus. This crossed some of that tract of bog and it wasn't too bad after a relatively dry spell, though there was one 'floaty' bit that had me skirting around to be sure. On returning I did use the Bangor Trail which skirts the western flank of Letterknockcuss and it is very very wet going so be prepared for your boots to disappear at least once. Linkback: mountainviews.ie/summit/878/comment/23858/
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Big-Foot on Knocklettercuss
by Big-Foot 24 May 2009
Set out to reach the summit of Knocklettercuss using the Bangor Trail out of Bangor. The trail begins at Bngor Tr (F86569 22670). Parking available beside the GAA pitches. At A (F86610 20820) I left the trail and started up the heather slopes. At sharp climb from 140m to 340m at B (F87106 20524), but then fairly flat up to the summit at C (F87595 19817). Good views to south of Nephin Beg range, and out to west of Achill. I returned back using same route. About 7.3km in total, 2 1/4 hours. Linkback: mountainviews.ie/summit/878/comment/3780/
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            MountainViews.ie picture about Knocklettercuss (<em>Leitir Cois</em>)
Picture: Slieve Carr from Knocklettercus
Slieve Doom
by Geansai 28 Jul 2011
I followed in the footsteps of Big Foot. Bangor is a lovely place with the feel of a wild west frontier town especially when you appreciate its isolation even more by looking down on it from the slopes of Knocklettercuss. The summit plateau is quite large. Goes on for almost a mile maybe before you hit the highest point. There's a large cairn on the way to the trig pillar whose silhouette beckons you from the horizon. Great view across to Slieve Mor to the west but the Slieve Carr massif dominates Knocklettercuss looming over it like some kind of forbidden mountain. Like Frodo on the way to Mordor perhaps. Well I turned back at this point. Maybe another time. Linkback: mountainviews.ie/summit/878/comment/6442/
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            MountainViews.ie picture about Knocklettercuss (<em>Leitir Cois</em>)
Nice circular route
by PaulRevere 13 Jul 2013
Climbed 13.7.13 with Mrs and three kids. Parked at gaa pitch and headed along bangor trail. Similar to last comment turned up the slopes to top. Steep climb but very flat at top. Went down other side to Briska and back into Bangor. 4 and half hours. Linkback: mountainviews.ie/summit/878/comment/15039/
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            MountainViews.ie picture about Knocklettercuss (<em>Leitir Cois</em>)
Picture: Cairn
Simple ascent from the Bangor Trail
by Geo 12 Jun 2023
Done as a first step in a great circle route to make a weekend of it, bagging some new summits.
Start in or about Bangor Erris village, there's oodles of parking on the newly improved road in by the GAA club, and from here, follow the trail a short distance, and peel off left up the hill when the trail becomes wet, which it does rather quickly. The climb is easy, no great obstacles, and you can be at the top in an hour or so. There's a cairn and a trig a little distant from each other.
There's a trig and great views around, possibly an underrated or perhaps ignored Hill as most people will probably be doing the Bangor Trail if in this area. Linkback: mountainviews.ie/summit/878/comment/23985/
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British summit data courtesy:
Database of British & Irish Hills