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Castlemahon Mountain 128m,
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Energy sapping trudge over, rough, sponge-like terrain.

Long walk for one Carn.

Croaghonagh: Broad tracks all the way to top.

Dull trek up forest tracks

Beakeen

Carrickbyrne Hill: Very overgrown but passable

Tievummera Highpoint: An obvious stop along the ridge

Iron Bridge, Croaghanmoira and Ballyteige circuit.

Faha Ridge: Testing ridge with narrow irregular path. Often extreme.

Hare Island: A very pleasant four hours

Garinish Island: White-tailed sea eagles on Gairinish

Slieve Carr

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Belfast Hills Area   SE: Strangford & Portaferry Subarea
Place count in area: 9, OSI/LPS Maps: 15, 20, 21 
Highest place:
Divis, 478m
Maximum height for area: 478 metres,     Maximum prominence for area: 380 metres,

Places in area Belfast Hills:
E: Belfast Hills East:   Cairngaver 217mOuley Hill 186mScrabo Hill 160m
N: Belfast Hills North:   Carnmoney Hill 231.1mCave Hill 368mDivis 478mSlievetrue 312m
SE: Strangford & Portaferry:   Ballywhite Hill 101mCastlemahon Mountain 128m

Note: this list of places includes island features such as summits, but not islands as such.
Rating graphic.
Castlemahon Mountain Hill Down County in NI and in Ulster Province, in Binnion List, Sandstone Bedrock

Height: 128m OS 1:50k Mapsheet: 21 Grid Reference: J55588 47265
Place visited by 18 members. Recently by: trostanite, Kirsty, Vfslb1904, dregish, Carolyn105, Fergalh, eamonoc, Ulsterpooka, LorraineG60, MichaelG55, AntrimRambler, Wilderness, sandman, Garmin, chalky
I have visited this place: NO (You need to be a logged-in member to change this.)

Longitude: -5.607877, Latitude: 54.350327 , Easting: 355588, Northing: 347265 Prominence: 120m,  Isolation: 6.1km,   Has trig pillar
ITM: 755502 847265,   GPS IDs, 6 char: CstlMn, 10 char: CstlmhMntn
Bedrock type: Sandstone, (Hawick Group)

Castlemahon Mountain is the 1495th highest place in Ireland. Castlemahon Mountain is the most southerly summit and also the second most easterly in the Belfast Hills area. It's also the second most easterly summit in Ireland.

Linkback: https://mountainviews.ie/summit/1368/
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A Strangford Lough balcony... .. by group   (Show all for Castlemahon Mountain )
 
MountainViews.ie Picture about mountain Castlemahon Mountain  in area Belfast Hills, Ireland
Picture: Castlemahon mountain summit trig
 
My outing to Castlemahon summit.
by Ulsterpooka  12 Oct 2017
I followed Peter Walkers route and asked permission to walk to the summit mast. The person was very friendly and accommodating. I parked at the last house in what is a four house dwelling lane. The second last house has 'Joe' in centre of the metal gate. I assume a reference to Joe's mountain on a stone Boulder further up. I followed the track until the mast and found the trig pillar nearby. The Mourne mountain range can be seen as well as Strangford Lough and the Isle of Man on a good day. Linkback: https://mountainviews.ie/summit/1368/comment/19749/
Your Score: Very useful <<  >>Average
 
(End of comment section for Castlemahon Mountain .)

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Some mapping:
Open Street Map
(Various variations used.)
British summit data courtesy:
Database of British & Irish Hills
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MountainViews.ie, a Hill-walking Website for the island of Ireland. 2400 Summiteers, 1480 Contributors, maintainer of lists: Arderins, Vandeleur-Lynams, Highest Hundred, County Highpoints etc