It looks, at first glance, like a natural thicket. It is not. The trees follow the curve of a deliberately constructed enclosure, and the combination of planted perimeter and sheltered interior gives the whole thing the quality of a room that has simply grown over.

The structure is subcircular, measuring around 33 metres north to south and 28 metres east to west, defined by a narrow spread of stone, between one and two metres wide and less than a metre high where it still stands. There is no visible entrance and no internal features that survive above ground. What makes the site particularly interesting is its classification: although it was recorded as a straightforward enclosure in the Record of Monuments and Places in 1996, it carries the designation of a designed landscape feature, specifically a tree-ring. These were deliberate ornamental plantings, common on eighteenth and nineteenth century estates, where a circular or oval belt of trees was established, often on a low earthwork or wall, to create a visual accent in the landscape or provide shelter. The Ordnance Survey six-inch maps of both 1842 and 1921 show the enclosure with trees already in place, meaning the planting had been established well before the earlier survey and persisted largely unchanged for at least eighty years after it. The ash trees on the perimeter and the hazel within are, in a sense, the living continuation of whoever decided, at some point before the mid-nineteenth century, that this particular slope deserved marking out.