 The UAE's oil reserves are the sixth-largest in the world while its natural gas reserves are the world's seventh-largest.Sheikh Zayed, ruler of Abu Dhabi and the first President of the UAE, oversaw the development of the Emirates and steered oil revenues into healthcare, education and infrastructure.The UAE's economy is the most diversified in the Gulf Cooperation Council, while its most populous city of Dubai is an important global city and international aviation and maritime trade hub.