Sicily (the largest island in the Mediterranean Sea, an autonomous region of Italy, close to Africa and separated from Tunisia and Libya by the Strait of Sicily)
Sihanoukville (a city, the provincial capital of Sihanoukville, Cambodia); Sihanoukville (a province of Cambodia; capital: Sihanoukville); Sihanoukville (a port in Sihanoukville, Sihanoukville, Cambodia)
Silesia (a cultural region of Central Europe, now chiefly in Poland, with small portions in the Czech Republic and Germany, from early modernity until 1945 predominantly German-speaking with Slavic-speaking minorities (and local majorities))
Singapore (an island and city-state in Southeast Asia, located off the southernmost tip of the Malay Peninsula; a former British crown colony and state of Malaysia (1963-1965))
Zion (a hill in West Jerusalem, in Israel, on which ancient Jerusalem was partly built; a centrepiece to Biblical accounts of old days and future eschatological events)