|Lake type||Limestone lake|
|Max. length||16.1 km (10.0 mi)|
|Max. width||6.4 km (4.0 mi)|
|Surface area||83 km2 (32 sq mi)|
|Average depth||15 m (49 ft)|
|Max. depth||57 m (187 ft)|
|Water volume||1.3 km3 (1,100,000 acre·ft)|
|Residence time||0.28 years|
Lough Mask (Irish: Loch Measca) is a limestone lough (lake) of 20,500 acres (83 km²) in County Mayo, Ireland, north of Lough Corrib. Lough Mask is the middle of the three lakes, which empty into the Corrib River, through Galway, into Galway Bay. Lough Carra flows into Lough Mask, which feeds into Lough Corrib through an underground stream which becomes the River Cong. The lake is popular for its trout fishing.
In 1338 Sir Edmond de Burgh was drowned in the lake by his cousin Sir Edmond Albanach Bourke of County Mayo, at the end of the Burke Civil War 1333–38. He was captured at Ballinrobe and taken to Oilean-an-lara (the Earls Island) where he was killed.
According to a side-note on the manuscript containing the oldest copy of 'Tóruigheacht Dhiarmada agus Ghráinne' ("The Pursuit of Diarmuid and Gráinne") (Royal Irish Academy Ms. 24.P.9), Irish scribe Dáibhídh Bacach ("lame David") Ó Duibhgeannáin was living and working on Oileán Ruadh ('Red Island') on Lough Mask in the house of Tadhg Og O Flaherty on the date, April 1, 1651.
The lough was the scene of the 1882 "Lough Mask murders", when two bailiffs working for Lord Ardilaun were killed, described as "an old man and a lad". Tensions had arisen in the area during the Land War and the proximity of land managed by Charles Boycott. The corpses were found in the lough itself. The controversial lack of credible witnesses led to four well-publicised trials of the accused in 1882-83.
According to local legend, a banshee haunts Bly Island, a small island in the lough. There have also been rumored sightings of a banshee around the shore of the lough as well as other forms of paranormal activity.
Petersburg Outdoor Education Center is situated on the shore of the lough, close to Bly Island. The center uses the lake for numerous water sports including kayaking, canoeing and sailing.
"Loch Measca" was taken as the pen-name of Séan Seoighe (John Joyce) in Eachtra múinteóra an Irish-language memoir published in 1929.
- MAYO COUNTY COUNCIL TOORMAKEADY WASTE WATER DISCHARGE Page 8 
- MAYO COUNTY COUNCIL TOORMAKEADY WASTE WATER DISCHARGE Page 12 
- Annual Summaries, The Times, 1882, pp. 182–186
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