South Lewis, Harris and North Uist is a large national scenic area (NSA) in the Western Isles of Scotland. It is one of 40 such areas in Scotland, which are defined so as to identify areas of exceptional scenery and to ensure its protection from inappropriate development. The designated area covers 202,388 ha in total, of which 112,301 ha is on land, with a further 90,087 ha being marine (i.e. below low tide level), making it the largest of the NSAs in both total and marine area. The designated area includes the mountainous south west of Lewis, all of Harris, the Sound of Harris and the northern part of North Uist.