This large natural harbour on the east coast of the northern Emirates has been an important site of maritime trade and settlement since the pre-Islamic era. There is some slight evidence, mainly from tombs, of settlement during the later 2nd millennium and the early first millennium BC, contemporary with such sites as Shimal, Tell Abraq and Rumeilah. There is also scattered occupation during the period of al-Dur and Mileiha but it is in the period just prior to, and after, the coming of Islam that we hear most about Dibba. Under the Sasanians, and their Omani clients the Al-Julanda, an important market existed at Dibba and that it was sometimes the capital of Oman. According to Ibn Habib "merchants from Sindh, India, China, people of the East and West came to it."
Masirah (Arabic: مصيرة) is an island off the East coast of Oman, 95 km long north-south, between 12 and 14 km wide, with an area of about 649 km², and a population estimated at 12,000 in 12 villages mainly in the north of the island (9,292 as of the census of 2003, of which were 2,311 foreigners). Administratively, it forms one of the eleven provinces (Arabic: ولاية, plural ولايات, transliteration: wilayah, plural wilayat) of the Ash Sharqiyah Region. The principal village is Dawwāh in the northern part of the island. It contains an Omani air base and a fish factory, as well as a few small towns. Previously, the BBC had a relay facility consisting of both HF and MF broadcasting transmitters stationed there. Most of the island's interior is deserted, with access to the island only possible by a small ferry for cars or by Omani Air Force Hercules (RAFO) flights. The main industries are fishing and traditional textile manufacturing. Formerly, traditional ship building was important.