Tourism in the Arab world visitors include sunning, swimming, kite-surfing, diving, snorkeling, boating, surfing, beach combing and shell collecting. The beaches are popular with families, walkers, and joggers. They are lined with restaurants, snack bars and cafes. Desert safari is becoming a very popular activity; it can be either done on camels or by four-wheel drives. Nearly every Omani city and town has its own fort. Most of them were built or had major expansions during Al-Yarubi dynasty rule of Oman in between 1624 and 1744. They represent the fine Omani architecture and prosperity at that time. In times of war and with high and
Oil shale in China oil production or the oil shale-based power generation. After 2005, China became the largest shale oil producer in the world. In 2011, the country produced about 650,000 tonnes of shale oil. Most of production facilities are Fushun-type retorts. At the end of 2006, the Fushun Shale Oil Plant was the largest oil shale plant in the world. In 2005, the China National Oil Shale Association was established in Fushun. The main oil shale research institution in China is the China University of Petroleum. From 2004 to 2006 China undertook the national oil shale evaluation. According to the evaluation, it has