Although Ireland is not large in area, the mainland and associated islands have a coastline of over 4,000 km. There are just over 1,000 islands of a significant size (i.e. large enough to appear on the standard 1:126,720 Ordnance Survey maps in use in Ireland) and the majority have some breeding seabirds on them, although only about 20 could be regarded as being of great significance in terms

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