Mullaghmeen lies in the northern tip of County Westmeath, just inside the border with County Meath, and looks into the northern Lough Sheelin, which forms the border with County Cavan. The hill is 16 km north of the town of Castlepollard. At , the summit of Mullaghmeen is the highest point in County Westmeath, however, it is the lowest county top in Ireland. The soil of Mullaghmeen is limestone, and in 1936 the Department of Agriculture decided it would be suited to the planting of deciduous trees, and created the 400 ha Mullaghmeen Forest, the largest planted beech forest in Europe.