Minamiawaji is a city in the southern part of Awaji Island in Hyōgo Prefecture, Japan. As of 1 June 2022, the city had an estimated population of 45,489 in 19856 households, and a population density of 200 persons per km². The total area of the city is 229.01 square kilometres (88.42 sq mi).

Awaji Island is an island in Hyōgo Prefecture, Japan, in the eastern part of the Seto Inland Sea between the islands of Honshū and Shikoku. The island has an area of 592.17 square kilometres. It is the largest island of the Seto Inland Sea.