Sumoto (洲本市, Sumoto-shi) is a city located on Awaji Island, Hyōgo Prefecture, Japan. The city was founded on February 11, 1940. As of March 31, 2008, the city has an estimated population of 50,087 and a population density of 267 persons per km². The total area is 182.47 km². On February 11, 2006, the town of Goshiki (from Tsuna District) was merged into Sumoto. Sumoto City is famous for Awaji onions, Naruto oranges and Kobe Beef.