The South Bank is an entertainment and commercial district of Central London, England, next to the River Thames opposite the City of Westminster. It forms a narrow, unequal strip of riverside land within the London Borough of Lambeth and the London Borough of Southwark where it joins Bankside. As with most central London districts its edges evolve and are informally defined however its central area is bounded by Westminster Bridge and Blackfriars Bridge. Its name was adopted during the Festival of Britain over the local less attractive name of 'Lambeth Marsh'; it includes the County Hall, complex with the Sea Life London Aquarium, the London Dungeon, Jubilee Gardens and the London Eye, the Southbank Centre, Royal Festival Hall and National Theatre, among its long list of attractions. Both the County Hall and the Shell Centre contain major residential parts.