Southend (formerly known as Grey Town and Grey) is a town and locality in the Australian state of South Australia located in the south-east of the state on the southern shore of Rivoli Bay about 324 kilometres (201 mi) south-east of the state capital of Adelaide. The locality includes the following protected areas - Canunda National Park which occupies land in its south including the coastline up to Cape Buffon and which overlaps most of Lake Frome. The 2016 Australian census which was conducted in August 2016 reports that the locality of Southend had a population of 263 people.