Puffins breed in colonies on coasts and islands; several current or former island breeding sites are referred to as Puffin Island.
Lundy in the Bristol Channel may also be included, as its name means "Puffin Island" in Norse
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The USGS defines its southern boundary as a line extending from Point Colville on Lopez Island to Rosario Head on Fidalgo Island, and its northern boundary as a line from Point Migley on Lummi Island to the east tip of Puffin Island (just east of Matia Island) and then to Point Thompson on Orcas Island.