This conical oval mound, measuring approximately 42 metres from northwest to southeast and 35 to 40 metres across its northeastern to southwestern axis, stands 5 metres high with distinctly steep sides. The flat summit, which spans 15.5 metres by 10 metres, features scattered large stones protruding along its edges; these may be the remnants of an ancient enclosing wall that once crowned the structure.

The mound occupies a strategic position, with hilly ground dotted with rock outcrops providing natural surveillance points to the southeast and southwest. A stream marking the county boundary between Sligo and Leitrim flows along the eastern and southeastern flanks of the monument, adding to its defensive advantages. Now protected as National Monument number 277 under state ownership, this impressive earthwork has sparked considerable debate amongst archaeologists about its true origins.

Whilst traditionally classified as a motte, likely dating from the Anglo-Norman period, closer examination suggests the structure may actually be a modified natural ridge rather than an entirely artificial construction. This geological ambiguity has led scholars including Glasscock and Graham to question whether it truly belongs in the category of Norman fortifications. Regardless of its precise origins, the Mote of Gortlownan remains a compelling feature of the Sligo landscape, its imposing form a testament to either medieval military engineering or the ingenious adaptation of natural topography for defensive purposes.