When the Irish talk about fairy forts, they’re referring to the remains of stones set out in a circular arrangement and surrounded by one or many ditches or banks.

Celtic mythology ... appear in marshy areas—exist in mythologies around the world thanks to a real phenomenon that inspired the legends. Although the lights may seem supernatural, they’re ...

John Privilege (eds), 'The Supernatural in Ulster Scots Folklore and Literature Reader', Centre for Irish-Scottish Studies, Ulster University.