The Grianán is located on the western edge of a small group of hills that lie between the upper reaches of Lough Swilly and Lough Foyle. Although the hill is comparatively not that high, the summit dominates the neighbouring counties of Londonderry, Donegal and Tyrone. Located at the edge of the Inishowen peninsula.
Cycle up to 241 meters (An Grianan round castle) above sea level and back down. Track covers over 20k of varying terrain.