Low earthen banks, barely raised above the surrounding grassland, trace out a series of small enclosures within a large quadrangular field measuring roughly 270 metres east to west and 240 metres north to south. Some of these banks are accompanied by shallow fosses, the paired ditches that typically form the other half of a boundary earthwork, the spoil dug out to create a fosse being piled alongside to form the bank itself. Together they preserve the skeleton of a field system that predates the modern agricultural landscape, though the grass has long since grown over whatever activity once defined these divisions.

The relationship between the field system and the castle beside it adds another layer of interest. A possible avenue runs north-north-west from the castle towards a nearby road, suggesting that this was once an organised and intentional landscape rather than a patchwork that simply accumulated over time. Castlebellew itself provides the anchor point; the earthworks in the surrounding grassland appear to belong to the same designed environment, laid out in deliberate relationship to the castle rather than independently of it. The overall quadrangular form of the enclosing field, regular enough to read as a planned unit, reinforces the impression that what survives here is the faint but legible imprint of an estate or settlement arrangement that has otherwise vanished from the record.