An uninhabited little island in the Sound of Jura, Rhisa Mhic Phaidean (also Rèisa Mhic Phaidean) is located 1¼ miles (2 km) north northwest of Craignish Point. Rising to 10m (33 feet) above sea level and extending to 13.8 ha (34 acres), the island is composed of ancient metamorphic Phyllite rock crossed by Tertiary dykes. The island is one of several in this area noted for its unusual but thriving population of water vole (Arvicola amphibius). 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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