A field system, in archaeological terms, refers to the remains of ancient boundaries, banks, walls, or ditches that once organised agricultural or pastoral ground, and their survival into the present is often more a matter of accident than design. In many parts of the west of Ireland, such systems are detectable only from the air, or when low winter light throws long shadows across ground that otherwise looks unremarkable.

Corbaun is a small townland in Galway, and the presence of a recorded field system there places it within a broader pattern of ancient land use found throughout Connacht. Field systems in Ireland range in date from the Neolithic through to the post-medieval period, and the form they take, whether earthen banks, stone-faced boundaries, or ridge-and-furrow cultivation marks, can say a great deal about the communities that created them and the agricultural pressures they faced. Without further detail currently available on this particular site, the precise character and dating of the Corbaun system remains open, but its recognition as a monument signals that something of archaeological significance survives in the landscape there.