Arroo Mountain SAC is a mountain site in County Leitrim, which comprises blanket bog, heath and upland grassland on a limestone plateau. The summit supports a large area of wet heath and heath flora is well developed. Active blanket bog occurs in the south and in small areas scattered over the plateau. These areas support typical blanket bog plant species. Peregrine and Golden Plover breed within the site.

Boleybrack Mountain SAC comprises an extensive upland plateau situated to the north of Lough Allen in Co. Leitrim. It is dominated by active mountain blanket bog and wet heath, with small oligotrophic/dystrophic lakes scattered throughout.

Cuilcagh – Anierin Uplands SAC follows a series of shale uplands in the counties of Cavan and Leitrim, including to the north, Cuilcagh Mountain on the border with Northern Ireland, Benbrack, Bencroy, and to the south, Slieve Anierin, rising above Lough Allen. The site is of special interest because of its geology, physiography and upland flora and fauna.