Tullaghan is located on the N15 road between Sligo (35 km) and Bundoran, County Donegal (3 km). Tullaghan includes a small section of County Sligo and extends east to the edge of Lough Melvin and the Garrison lowlands, west to Bunduff strand (in the north Sligo coastal area) and south to the northern slopes of the Dartry Mountains and the Arroo and Mountain Outliers. The River Drowes denotes the border between County Leitrim and County Donegal and the River Duff forms the border between County Leitrim and County Sligo. The R280 road connects Tullaghan with the rest of County Leitrim. Tullaghan has the single shortest bit of county coastline in Ireland - a mere 2.5 kilometres long.