Ras Al Khaimah, the most northerly emirate, is ruled by another branch of the Al Qasimi family. It covers an area of 1,700 square kilometres. Thanks to the run-off water from the Hajar Mountains, Ras Al Khaimah has a unique abundance of flora, so it is no surprise that agriculture is important to the local economy. The emirate also benefits from its stone quarries, and fishing, which is plentiful in the rich waters of the Gulf. The city of Ras Al Khaimah, situated on an inlet, has a rich history. It was renowned for its prosperous port and for its exquisite pearls, which were famous as being the whitest and roundest available anywhere. Ras Al Khaimah's current ruler is Sheikh Saqr bin Mohammed Al Qasimi.