At Mullanashee in County Sligo, local knowledge holds that a souterrain lies somewhere within a rath, but the ground keeps its own counsel. No visible remains survive to confirm it, and the site offers no obvious invitation to look closer.

A souterrain is an underground stone-lined passage or chamber, typically associated with early medieval settlement in Ireland, and often interpreted as a place of refuge, food storage, or concealment. They are frequently found in association with raths, the circular earthwork enclosures that served as farmsteads for much of the first millennium. The rath at Mullanashee is a recorded monument, but the souterrain said to occupy its interior remains unverified, known only through the kind of accumulated local memory that archaeology sometimes struggles to either confirm or dismiss. It is the sort of detail that survives in a townland's informal record long after the physical evidence has been absorbed back into the earth.