Sume Island (Kisiwa cha Sume, in Swahili) is a protected island located in Fumba ward of Mjini District in Mjini Magharibi Region, Tanzania.

The island is included in the Menai Bay Marine Conservation Area.

Sume reef protects on the biodiverse island.

reefs on Sume Island in southern Zanzibar indicate that native Eucheuma denticulatum is flourishing there.

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