Larkfield fortLarkfield fort is a ringfort and National Monument located in County Longford, Ireland. On the Record of Monuments and Places it bears the code LF006-021----.LocationLarkfield fort is located east of Lough Gowna, from the edge. The nearest village is Mullinalaghta, to the southeast.DescriptionThe ringfort is a univallate bank and ditch with an entrance in the east.