Lagos, Nigeria’s largest city, sprawls inland from the Gulf of Guinea across Lagos Lagoon. Victoria Island, the financial center of the metropolis, is known for its beach resorts, boutiques and nightlife. To the north, Lagos Island is home to the National Museum Lagos, displaying cultural artifacts and craftworks. Nearby is Freedom Park, once a colonial-era prison and now a major venue for concerts and public events. The exact population of Metropolitan Lagos is disputed. In the 2006 federal census data, the conurbation had a population of about 8 million people. However, the figure was disputed by the Lagos State Government, which later released its own population data, putting the population of Lagos Metropolitan Area at approximately 16 million.As at 2015, unofficial figures put the population of "Greater Metropolitan Lagos", which includes Lagos and its surrounding metro area, extending as far as into Ogun State, at approximately 21 million.