A rocky islet in the Sound of Jura, Coiresa lies immediately to the southwest of the larger Rhisa Mhic Phaidean. It extends 2.75 ha (6.8 acres) the island is composed of metamorphic Phyllite rock with gabbro intrusions crossed by a Tertiary dyke. The island is one of several hereabouts noted for its well-studied population of water vole. These animals are thought to be descended from a pregnant female swept from the mainland, now unable to live in the typical riverside habitat.
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