High Quality Content by WIKIPEDIA articles! The Flannan Isles (Scottish Gaelic: Na h-Eileanan Flannach,pronounced ) or Seven Hunters are a small island group in the Outer Hebrides of Scotland, approximately 32 kilometres (20 mi) west of the Isle of Lewis. They may take their name from St Flannan, the 7th century Irish preacher and abbot. The islands have been devoid of permanent residents since the automation of the lighthouse in 1971. They are the location of an enduring mystery which occurred in December 1900, when all three lighthouse keepers vanished without trace.