Mweelrea

The geology of what is known as the Mweelrea Formation is very different from that of the Twelve Bens, on the other side of Killary Harbour. At a summary level, the Mweelrea Formation consists of Ordovician period sandstones originally deposited on large alluvial fans, and distally‐equivalent alluvial plains and delta fans. Interbedded with these sandstones are tufts, being ash deposits from Ordovician period volcanos.[11][12]

Mweelrea, and its subsidiary peaks, form the southern half of the "horseshoe-shaped" massif of the Mweelrea Mountains, which are bounded by Killary Harbour, Ireland's deepest fjord, to the south, and Doo Lough to the north.[5][6]

The valley in the centre of this "horseshoe" is the townsland of Glenconnelly (Irish: Gleann Choinnile).[13] Two deep corries lie at the head of the Glenconnelly valley, below Mweelrea's southeast face; the southerly corrie contains Lough Lugaloughan, while the northerly corrie contains Lough Bellawaum; both are drained by the Sruhaunbunatrench River, which empties into the Bundorragha River, which itself flows into Killary Harbour.[6]

Mweelrea at 814 metres (2,671 ft), is the highest mountain in massif, and is the provincial top for Connacht.[5][6] Mweelrea's prominence of 779 metres (2,556 ft) qualifies it as a Marilyn, and it also ranks it as the 16th-highest mountain in Ireland on the MountainViews Online Database, 100 Highest Irish Mountains, where the minimum prominence threshold is 100 metres.[8][14]

Northeast of Mweelrea is Ben Bury (or Irish: Ucht an Chreagáin, meaning "breast of the little crag"; it is also known as "Oughty Craggy"), at 795 metres (2,608 ft), and whose prominence of 60 metres (200 ft) qualifies it as a Vandeleur-Lynam (it is the 43rd-highest Vandeleur-Lynam in Ireland).[8][6]

Further east around the "horseshoe" lies the long high summit ridge of Ben Lugmore (and its subsidiary peaks), that is only slightly lower than Mweelrea at 803 metres (2,635 ft), and its northeast face forms the headwall of the cliff-lined Lug More Irish: Coum Dubh corrie.[5][6]

Southwest of Mweelrea is the southern arm of the "horseshoe", which is both lower and less sustained than the northern side. It includes the Mweelrea SE Spur at 495 metres (1,624 ft) (sometimes called "point-495" in guidebooks), and finishes with the isolated Teevnabinnia (Irish: Taobh na Binne, meaning "side of the peak"), whose height is only 379 metres (1,243 ft), but whose prominence of 214 metres (702 ft) qualifies it as a Marilyn.[8][6] West of Mweelrea lie the County Mayo beaches of Uggool Beach and Silver Strand.

• 
  Mweelrea (back left), and Ben Lugmore (centre), viewed from the east on the summit of Ben Gorm
• 
  Mweelrea and the corrie lake of Lough Bellawaum, as viewed from Ben Lugmore
• 
  Mweelrea massif as viewed from Leenaun Hill, with Mweelrea (back left), Ben Lugmore (back, right) and Teevnabinnia (centre, front)
• 
  Mweelrea viewed from the south in Renvyle
• 
  Mweelrea eastern summit ridge as viewed from Ben Bury

• Fairbairn, Helen (2014). Ireland's Best Walks: A Walking Guide. Collins Press. ISBN 978-1848892118.
• MountainViews Online Database (Simon Stewart) (2013). A Guide to Ireland's Mountain Summits: The Vandeleur-Lynams & the Arderins. Collins Books. ISBN 978-1-84889-164-7.
• Paul Phelan (2011). Connemara & Mayo - A Walking Guide: Mountain, Coastal & Island Walks. Collins Press. ISBN 978-1848891029.</ref>
• Dillion, Paddy (2001). Connemara: Collins Rambler's guide. Harper Collins. ISBN 978-0002201216.
• Dillion, Paddy (1993). The Mountains of Ireland: A Guide to Walking the Summits. Cicerone. ISBN 978-1852841102.

Wikimedia Commons has media related to Mweelrea Mountains.

• Maumturks, major range in Connemara
• Twelve Bens, major range in Connemara
• List of Irish counties by highest point
• Lists of mountains in Ireland
• Lists of mountains and hills in the British Isles
• List of P600 mountains in the British Isles
• List of Marilyns in the British Isles
• List of Hewitt mountains in England, Wales and Ireland

• MountainViews: The Irish Mountain Website, Mweelrea
• MountainViews: Irish Online Mountain Database
• The Database of British and Irish Hills , the largest database of British Isles mountains ("DoBIH")
• Hill Bagging UK & Ireland, the searchable interface for the DoBIH