Rustaq () is a town and Wilayah (District) in Al Batinah Region of northern Oman. The wilayah is in the Western Hajar Mountains, in the south of the Batinah. Rustaq was once the capital of Oman, during the era of Imam Nasir bin Murshid al Ya'arubi. Rustaq Fort, built four centuries prior to the 7th century CE, is an imposing structure built on three levels, containing separate houses, an armoury, a mosque and four towers. The tallest tower stands over high, and has a diameter of . The Al Hazm Castle is an outstanding example of Omani Islamic architecture and was built in 1711 AD. The fort's roof is built on columns, and contains no wooden supports. Its walls can withstand great impact, at no less than thick at any point. Rustaq is an area of healing warm springs, the most notable being 'Ain al-Kasafa. Its waters runs at and are regarded as a cure for rheumatism and skin diseases due to its sulphur content. There are three popular wadis to visit: Wadi Bani Ghafar, Wadi al-Sahtan and Wadi Bani Auf. In addition, the mountains are pitted with caves such as Al Sanaqha Cave with its own subterranean springs. One of the main occupations in Rustaq is beekeeping. Pure Omani honey is a most sought-after commodity and is of the highest quality. Fruits such as pomegranates, apricots, plums and grapes are grown on the foothills of the Akhdar Mountains and brought to Rustaq for sale. There are also historical mosques in Rustaq, including the Al-Bayada Mosque, the Basra Mosque and the Qasra Mosque. Etymology The name of this town is a derived from the Middle Iranian rōstāg, meaning "district" (also in Baluchi, Persian, Kumzari, etc.), New Iranian rusta, meaning a 'large village.' The term is a cognate to other Indo-European tongues such as Latin, where 'rustica', means the same thing (whence the source for the English term, 'rustic'). History During the days of the Sasanian Empire, Al-Rustaq had a Persian marzban (military governor), whom Sasanians in the area would report to. Dibba and Tuwwam, which Oman today shares with the UAE, were taxed by Al-Julanda, who were clients of the Sasanians. There are also historical mosques in Rustaq, including the Al-Bayada Mosque, the Basra Mosque and the Qasra Mosque. Economy Industries Industries prospered over the years due to the elementary needs of people Al Rustaq and some other states and