Lough Boderg is a shallow, interconnected lake situated on the Upper Shannon system along the border between counties Roscommon and Leitrim, lying immediately upstream of the villages of Dromod and Rooskey. Part of the Shannon Navigation, the lake sits at an altitude of 37 metres above sea level and is classified as a shallow water body with a mean depth of less than 4 metres and moderate alkalinity (20–100 mg/l CaCO3). Together with Lough Bofin and Lough Scannal, it forms a complex of connected lakes, with Lough Boderg flowing downstream into Lough Bofin via the Derrycarne narrows. The deepest part of the entire lake complex is found in Lough Scannal, which forms part of Lough Bofin. Lough Boderg is widely regarded as the better fishery within this connected system and draws both competition and leisure anglers to its productive waters. The broader Upper Shannon region is so expansive and rich with interconnected loughs and river channels that much of the water sees relatively light angling pressure, making Lough Boderg's accessible shoreline at Derrycarne Forest Park a particularly valued destination.