"Jaziiratul Khadhraa (The Green Island) is also a large island in the land of Zinj in the Indian Ocean. It is long and wide. Salt water is surrounding it on every side. In it are two towns. One is called Matumbini, and the name of the other is Mkumbuu. In each of the towns is a Sultan of its own. Each of the town has its own independence. There are also other villages and markets.Its Sultan says he is an Arab, and that he has come to stay there from Al-Kufa (in Iraq). I have been told this by Sheikh Salim Abdel Malik Al Halawi who came from Basra. He saw this with his own eyes, and knows it. He is a reliable man."

Matumbini is an island south of the port of Mkoani, and Ras Mkumbuu is at the end of a long and narrow isthmus on the west coast of Pemba at the entrance to Chake Chake. At Mkumbuu, or Ndagoni to be exact, there are ruins of a mosque which J.S. Kirkman, the archaeologist,

          "considers to be the second finest Jami or congregational mosque in the territories of Tanganyika, Kenya and Zanzibar."

There are also a number of pillared tombs and some dwelling- houses. At Pujini, on the east coast of Pemba, there are ruins which are reputed to have been left by the Wadiba, and particularly by the so-called Mkame Ndume, Muhammad bin Abdulrahman. The dynasty of this man ruled part of the eastern portion of Pemba from the end of the fifteenth century to the beginning of the seventeenth. To the Wadiba is accredited the introduction of the coconut palm, and the building of the Mitepe, sailing boats made by tying together wooden planks with ropes, instead of using nails. This is done until today by the Wagunya or Bajuni. Msasani at Dar es salaam used to be called Rhapta in ancient times, from the Arabic "RABT'A", i.e. tying together, indicating where the Mitepe of sewn boats used to be built in the past. From this comes the Swahili word: Robota, meaning a bundle which has been carefully bound together.