Mangapwani is a town on the Tanzanian island of Unguja, the main island of Zanzibar. It is located on the northwest coast, 25 kilometers (16 miles) north of the Zanzibari capital of Stone Town. The shoreline here contains numerous caves, some of which were used for holding slaves during the black-market slave trade of the 1840s. Among the caves is a popular attraction, the Coral Cavern, which is located two kilometers south of the town.