From the Wikipedia page 
Chake-Chake is a city located on the Tanzanian island of Pemba. It is in the centre of a deep indentation in the west coast called Chake-Chake Bay.
Chake-Chake is the capital of Pemba Central region. Pemba's only airport is 7 km south-east of Chake-Chake. The Mkama Ndume ruins are close to the airport in Pujini village.