Sassanian Last Persian empire before the expansion of Arab peoples, 224 - 642 CE.
Srivijaya Empire in Southeast Asia that controlled trade from the fifth to fifteenth century CE.
Sumerian From Sumer, the earliest Mesopotamian society.
Swahili East African people who speak Swahili, the Bantu language that draws upon borrowed Arabic words as well as words from other languages spoken by mariners in the Indian Ocean.
Zambezi River 2750 kilometer-long river that starts in southern Africa and empties into the Indian Ocean.
Zanzibar Island off the coast of Tanzania controlled by the Omani of the southern Arabian coast.