Lough Arrow

Lough Arrow is a large spring fed limestone lake with a surface area of 1,247ha located in Counties Sligo and Roscommon in the Republic of Ireland. It is a natural lake with moderate nutrient levels and an intermediate level of ecological productivity. Its nutrient levels have remained largely unchanged over the past 40 years, making Lough Arrow quite rare and hydrologically different from other lakes.

Lough Arrow supports a diverse range of aquatic plants, and is home to the highest densities of breeding Great crested glebe, Merganser and Tufted duck in western Ireland. It is also notable for its Brown trout and Eel populations, and Otter has been recorded at the site.

Lough Arrow

CANN Works

Over the lifespan of the project, the CANN team will be working on producing a Conservation Action Plan for Lough Arrow and a detailed habitat map of the lough and the surrounding area, both of which will be used to guide the site towards a favourable conservation status. On the ground conservation actions to be carried out include monitoring of water quality, biodiversity surveys, assessment of environmental pressures, invasive species management, species specific actions, and the introduction of biosecurity boxes for leisure users of the lough.


Charophytes, also known as Stoneworts are a type of green algae that grow on the bottom of alkaline lakes, such as limestone lakes. They get their common name “Stonewort” because they may have become encrusted with lime (calcium carbonate) making them rougher and stiffer than other plants, and bearing a stone like appearance. They often form dense beds covering a significant area of the lake bottom, and provide food and habitat for fish and other aquatic species.
Lough Arrow, Ireland

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