Alexandria is the third-largest city in Egypt after Cairo and Giza, seventh-largest city in Africa, and a major economic centre. With a total population of 5,200,000, Alexandria is the largest city on the Mediterranean – also called the "Bride of the Mediterranean" by locals – the fourth-largest city in the Arab world and the ninth-largest urban area in Africa. The city extends about 40 km (25 mi) at the northern coast of Egypt along the Mediterranean Sea. Alexandria is a popular tourist destination, and also an important industrial centre because of its natural gas and oil pipelines from Suez.