Lough BarraLough Barra is a freshwater lake in the northwest of Ireland. It is located in north County Donegal in the valley along the Gweebarra fault.GeographyLough Barra is about west of Letterkenny, just outside the southwest corner of Glenveagh [National Park]. It measures about long and wide.HydrologyLough Barra is fed mainly by the Barra River entering at its northern end. The lake drains southwards into the Gweebarra River. The lake, like other area lakes, is oligotrophic.Natural historyFish species in Lough Barra include brown trout, salmon and the critically endangered European eel. Lough Barra is part of the Cloghernagore Bog and Glenveagh National Park List of [Special Areas of Conservation in the Republic of Ireland#Donegal|Special Area of Conservation], which also includes Lough Beagh.