A midden is, at its simplest, a rubbish heap, the accumulated cast-offs of people who once ate, worked, and lived in a place. Shells, animal bones, charcoal, broken pottery, and occasionally human remains can all be compressed into these deposits over generations, making them remarkably legible records of everyday life in a way that more celebrated monuments rarely are.

Tóin An Tseanbhaile lies in County Mayo, a county whose coastline and islands have produced midden sites spanning thousands of years, from Mesolithic shell middens left by some of Ireland's earliest inhabitants through to the refuse layers of early medieval settlements. The name of this particular townland carries its own quiet history, the word "tóin" suggesting a marginal or rear portion of settled land, a peripheral spot that communities sometimes used for exactly the kind of disposal that middens represent. Beyond its classification and location, the specific details of this site remain to be fully documented and made publicly available.