Lagos is the second largest city in Africa and the most populous city in Nigeria and in West Africa. There are about 12.5 million to 18 million people living in Lagos, which makes it one of the biggest cities in Africa. Lagos is surrounded by the Atlantic Ocean. The city is made of several local government areas. Some of these areas are Somolu Koshofe, Ifelodun, Surulere, Agege, Ikeja, Ikorodu, Ajegunle, Oshodi, and Maryland.