Maps are only one way of knowing the shape of a place. Before the borders of England’s parishes were definitively mapped, people learned the boundaries of their community by foot. Every year, a few days before the feast of the Ascension, the members of each parish would come together to walk the edge of their common lands.
The practice was called “beating the bounds,” and the purpose was to create a shared mental map of the parish, to ensure that neighboring communities couldn’t encroach on their land. They carried flags, sang songs, read homilies, and used slender willow-branches to swat the landmarks that separated one parish from another.
— Read on daily.jstor.org/beating-the-bounds/