Harris is the southerly and also more mountainous part of Lewis and also Harris, the biggest island in the Outer Hebrides, Scotland. Although not an island itself, Harris is often referred to as the Isle of Harris, which is the previous postal region as well as the existing message town for Royal Mail postcodes starting HS3 or HS5; see HS postcode location. St Kilda, an uninhabited small island chain, situated 40 miles (64 kilometres) west-northwest of North Uist is taken into consideration part of the civil church of Harris. The same holds true for the remote uninhabited rock islet Rockall, which is 230 miles (370 km) west of North Uist. According to the 2011 Census, there are 1,212 Gaelic audio speakers (60%) in Harris.