South Walls is an inhabited tidal island adjacent to Hoy in Orkney, Scotland. The name is a corruption of "Sooth Was", which means the "southern voes" - as with Kirkwall, it was assumed that it was a mispronunciation of "walls". South Walls forms the southern side of the harbour of Longhope. It was a tidal island until a narrow causeway, was constructed over the sandbank in 1900, which was known as the Ayre, although this name has become transferred to the causeway itself. Although sometimes considered to be a peninsula, it is an island in all but name. South Walls is a popular stopping off place for barnacle geese.
