Morocco is located in the Maghreb region of North Africa, bordering the Atlantic Ocean and the Mediterranean Sea. The capital is Rabat. One of its most strategic geographical features is the Strait of Gibraltar, which separates Morocco from Spain by only 14 kilometers. The country is dominated by the Atlas Mountains, which run from the southwest to the northeast, separating the fertile coastal zones from the Sahara Desert. Morocco is the world's largest exporter of phosphates and has a diverse economy. It is also home to the Sahara's largest sand dunes, such as Erg Chebbi. The city of Casablanca is the largest in the country and serves as its primary economic and industrial hub.