At 3.4 metres high and roughly 11.6 metres across at its base, it is substantial enough to catch the eye, yet its setting among planted trees gives it the air of a deliberate garden feature rather than something considerably older.

A bowl-barrow is a type of prehistoric burial monument, typically a rounded earthen or stone mound raised over one or more interments, often dating to the Bronze Age. This particular example is composed of earth and stone and, notably, shows no evidence of an enclosing fosse, the circular ditch that usually rings such monuments and from which material was quarried to build the mound itself. Its absence here is an unusual detail. Whether the mound was always without one, or whether its original form was altered during later use, is unclear. What seems likely is that when the grounds around Congor House were being laid out in the nineteenth century, the mound was incorporated as a landscape element, a practice not uncommon among estate designers of that era who occasionally found prehistoric earthworks a convenient addition to their grounds, lending a sense of antiquity and drama to the approach to a house.