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.

• Gulf of Morbihan
• Gavrinis

• Burl, Aubrey (2005). A Guide to the Stone Circles of Britain, Ireland and Brittany (revised edition). Yale University Press. pp. 255–256. ISBN 0-300-11406-0.
• Philippe Gouezin and Eric Le Gall. Le Site mégalithique d'Er Lannic. Association "Archéo douar Mor".

• Stones of France - Er Lannic Stone Circle

47°34′5″N 2°53′49″W / 47.56806°N 2.89694°W / 47.56806; -2.89694