The land above it has been levelled so completely that no trace of the original enclosure survives, and the souterrain at its centre exists now only in the archaeological record, preserved in notation rather than in stone or soil.

A souterrain is a man-made underground structure, typically a series of narrow passages or chambers built from drystone walling and roofed with large flat slabs, commonly associated with early medieval ringforts across Ireland. They are thought to have served as storage spaces, refuges, or both. The ringfort at Bengour, a type of enclosed farmstead once defined by an earthen bank and ditch, is recorded under a separate monument reference and had already been levelled by the time Seán P. Ó Ríordáin noted the souterrain in 1933. His brief published record places the underground feature at the centre of the vanished enclosure, which is precisely where souterrains are often found, tucked beneath or beside the domestic buildings that once stood within the fort's interior.

What makes Bengour quietly interesting is the layers of disappearance involved. The ringfort itself is gone, erased by agriculture or land improvement at some point before the 1930s. The souterrain that once gave it a degree of concealment and utility survives only because someone wrote it down. The ground at Bengour gives nothing away.