Gortnavreeghan is bounded on the north by Brackley, Templeport townland, on the west by Carrick East and Bawnboy townlands, on the southeast by Ballynamaddoo and Corneen townlands and on the east by Mullanacre Upper townland in Tomregan parish. Its chief geographical features are Slieve Rushen mountain on whose western slope it lies, three small mountain lakes including Miles' Lough, mountain streams, mountain bogs and forestry plantations. It forms part of the Slieve Rushen Bog Natural Heritage Areaelectronic Irish Statute Book (eISB) Gortnavreeghan is traversed by minor roads and rural lanes. The townland covers 383 statute acres.