Hagstones: Holed Stones in Folk Belief

A hagstone, sometimes called a holey stone, adder stone or witch stone depending on region, is a naturally formed stone with a hole worn through it, usually by water erosion. These stones have attracted folk belief for centuries, particularly in coastal and riverside communities where they are commonly found.

How hagstones form

Hagstones are not manufactured objects. They form naturally when flowing water, often combined with sand or grit, wears away a softer point in a stone over a long period, eventually boring a complete hole through it. Because the process depends on chance weaknesses in the stone, each hagstone has a unique shape and hole size, which may partly explain why they were considered special or singled out from ordinary stones.

Traditional beliefs

In various folk traditions, a hagstone was thought to offer protection, particularly against nightmares, illness, or malevolent influences associated with hags or witches. A common belief held that looking through the hole in the stone allowed a person to see things hidden from normal sight, including fairies, spirits or the true nature of a deceptive person.

Hagstones were sometimes hung near doorways, stables or beds, strung on cord or wire, with the idea that the hole would trap or confuse harmful spirits attempting to pass through. Farmers in some regions reportedly hung them in barns in the belief that they protected livestock from being ridden or exhausted overnight by supernatural visitors, a belief closely tied to the idea of hag-riding discussed elsewhere on this site.

Regional names and variations

The same type of stone appears under different names depending on location, including adder stone, snake stone, witch stone or fairy stone. While the specific beliefs attached to the stone vary by region, the recurring theme across most traditions is protection, often specifically protection during sleep or from unseen forces.

Collecting hagstones today

Today, many people collect hagstones simply as interesting natural objects found on beaches, riverbanks or shingle shores, without necessarily holding the older superstitions attached to them. They remain popular among beachcombers and stone collectors because of their natural rarity and the satisfaction of finding one unexpectedly.

If you are interested in the history of these objects, it can help to separate two layers of information: the geological explanation for how the stones form, which is well understood and consistent, and the folklore layer, which varies considerably between regions, time periods and individual storytellers. Treating folklore as cultural history rather than factual claim is the most accurate way to study it.

Why the belief persisted

Before modern geology explained erosion processes, a naturally holed stone would have appeared genuinely unusual, since most stones found on a beach or riverbed are solid. This rarity likely contributed to the stones being treated as special objects worth collecting, displaying or using in protective rituals, regardless of the specific supernatural explanation attached to them in any given community.