<P> Lagos is loosely classified into two main geographical areas - the "Island" and the "Mainland". </P> <P> The Island is a loose geographical term that is used to define the area of Lagos which is separated from the "mainland" by the main channel draining the lagoon into the Atlantic Ocean, which forms Lagos Harbour . The Island is mainly a collection of islands that are separated from each other by creeks of varying sizes and are connected together by bridges . The smaller sections of some creeks have been dredged and built over . This part of Lagos is the area where most business activities and entertainment events in Lagos takes place . It also houses most of the upscale residential areas in Lagos . The Local Government areas which are considered to be in the Island include: Lagos Island, Amuwo - Odofin, Apapa (sometimes also regarded as being on the mainland) and Eti - Osa . The major upscale island neighbourhoods within these LGAs include: Ikoyi and Victoria Island . Three major bridges join the island to the mainland . They are the Carter Bridge which starts from Iddo, the Eko Bridge (formerly called the Second Mainland Bridge) and the Third Mainland Bridge, which passes through densely populated mainland suburbs to the Lagos Lagoon . </P> <P> Lagos Island contains a central business district . This district is characterised by high - rise buildings . The island also contains many of the city's largest wholesale marketplaces (such as the popular Idumota and Balogun Markets). It also has the National Museum of Nigeria, the Central Mosque, the Glover Memorial Hall, Christ's Church Cathedral (CMS) and the Oba's Palace (Iga Idunganran). Another major part of Lagos Island is Marina . It borders around the idumota and Balogun markets and houses major Banking institutions . Though formerly in a derelict condition, Lagos Island's Tinubu Square is a site of historical importance; it was here that the Amalgamation Ceremony that unified the North and South protectorate to form Nigeria took place in 1914 . </P> <P> Ikoyi is situated on the eastern half of Lagos Island and joined to it by a land fill . Ikoyi is also connected to Victoria Island by Falomo bridge, which carries a main road over Five Cowrie creek . Ikoyi housed the headquarters of the federal government of Nigeria and other buildings owned by the government, including the old federal secretariat complex . The complex today is on reestablishment . </P>

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