The Caha Mountains have been listed as a Special Area of Conservation. The underlying rock is Old Red Sandstone and the terrain generally consists of rocky crags and outcrops interspersed with grassy slopes. The southern part of the range has a broad ridge with a boggy plateau dotted with small lakes, and there are substantial cliffs in the northwestern part. Other habitat types include blanket bog, wet and dry heathland, scree slopes and species-rich grassland.