A souterrain, to use the term common in Irish archaeology, is an artificial underground structure, typically built during the early medieval period, consisting of one or more chambers connected by low, narrow passages and roofed with large stone lintels. They are found in considerable numbers across Ireland, though their precise purpose is still debated: refuge from attack, cool storage for dairy produce, or some combination of both, depending on the site and the season.

The Inchincummer souterrain is recorded as a known monument, but detailed information about its dimensions, construction, condition, or the broader archaeological context of the townland remains unavailable in the public domain at present. Kerry as a county contains a notably dense concentration of early medieval remains, and souterrains in the region are often associated with ringforts, the circular enclosed farmsteads that characterised rural settlement in Ireland from roughly the fifth to the twelfth centuries. Whether the Inchincummer example sits within or adjacent to such a feature is not currently documented in accessible sources.