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The island of Zanzibar, on the Swahili Coast, is a blend of African and Arab cultures. During its history it was a trade port for Asian and African goods, including slaves. Also on the island are plantations which grow such spices as cloves and cinnamon.

Zanzibar was a slave trading port from its earliest days.
Below is one of two cellars where slaves were held until being sold.
The vertical space is only about a meter high, except for the drain at lower right. Notice the chains...
Sultan Barghash closed the slave market in 1873.