page_title: List of islands of County Mayo
section_title: Larger Islands
hierarchical_section_title: List of islands of County Mayo / Islands of Mayo by Area / Larger Islands
caption_attribution_description: English: Bartragh Island from Bartragh Head The main channel of the River Moy estuary separates the dunes of Bartragh from the island
context_page_description: This articles lists the islands of County Mayo, the mainland of which is part of the island of Ireland. Included in this list are named offshore and freshwater islands as recorded by Ordnance Survey Ireland or the Placenames Database of Ireland. Additionally, areas of ecological significance related to both offshore and freshwater islands, designated by the National Parks and Wildlife Service, are also listed.
  Although County Mayo has hundreds of offshore and freshwater islands, only a handful of islands and island groups are large enough to be distinguishable on a typical map of the county, namely Achill Island, Clare Island and Inishturk, along with the island clusters of Duvillaun, Inishkea, Clew Bay and the major loughs. There are over 100 islands which are greater than 10 acres in area. The largest island is Achill, which extends to 148 km², making it Ireland's largest offshore island.
  Due to its abundance of bays, inlets and offshore islands, Mayo has the longest coastline of any county in Ireland, at 1,168 km or approximately 21% of the total coastline of the State. The geology and geomorphology of the county and its islands is among the most varied and complex in Ireland.
context_section_description: With the exception of Achill, County Mayo's islands are generally small in size, with only 13 larger than 100 acres (40 ha) and 3 larger than 1,000 acres (400 ha). There are numerous offshore islands in the 10 to 100 acre range, along with at least 15 freshwater islands larger than 10 acres, the largest of which is Illannaglashy on Lough Conn at 82 acres (33 ha).
  The one hundred largest islands in the county are listed below. "F" designates a freshwater island.
caption: Bartragh Island
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