Benlettery is the southernmost peak of the Twelve Bens and lies at its western edge. Benlettery is connected to the range by a high northerly ridge to the peak of Bengower ; this ridge forms a fork which also connects neighboring Benglenisky to Bengower. Benlettery is one of the six Bens that form a horseshoe around the valley of the Glencoaghan River (also known as the Glencoaghan Horseshoe).