Corneen is bounded on the north by Gortnavreeghan townland, on the west by Ballynamaddoo, Gowlagh North and Killywaum townlands, on the south by Munlough North townland and on the east by Mullanacre Upper townland in Tomregan parish and by Clontycarnaghan townland. It lies on the southern slope of Slieve Rushen mountain. Nearby is Miles' Lough, a small lake. Chief geographical features are mountain streams, mountain bogs, forestry plantations and dug wells. The southern part of the townland is used for agriculture. It forms part of the Slieve Rushen Bog Natural Heritage Area Corneen is traversed by minor roads and rural lanes. The townland covers 206 statute acres, extends for about from north to south, but is only a few hundred meters wide from west to east.