Nestled in the rugged landscapes of north County Donegal, Lough Barra is a pristine freshwater lake situated in a valley along the Gweebarra fault, approximately 30 kilometers west of Letterkenny and just outside the southwest corner of Glenveagh National Park. This oligotrophic lake, characterized by exceptionally clean, clear waters with low nutrient levels, spans about 1.5 kilometers in length and 1 kilometer in width. It occupies a glacially excavated rock basin in granite bedrock, with a surface elevation of 90 meters. The lake is fed principally by the Barra River at its northern end and drains southwards into the Gweebarra River. The surrounding area is part of the Lough Barra Bog Nature Reserve, a 176-hectare expanse of intact Atlantic blanket bog, creating a dramatic setting of exposed rock, scree slopes, and peat-covered terrain against the backdrop of the Derryveagh Mountains.