Er Lannic is a small island in the commune of Arzon, in the Morbihan department in Brittany in northwestern France. Er Lannic is a bird reserve and also the site of two stone circles, the southern of which is submerged.

Late Neolithic and Early Bronze Age stone circles of Ireland, Britain, and Brittany | |
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| Northern Ireland |
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| Republic of Ireland |
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| Southern England |
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| Wales |
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| English Midlands |
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| Northern England |
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| Scotland |
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| Brittany |
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| Authority control |
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