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This 55-acre (220,000 m2) theme park was constructed as part of a major expansion that transformed the Disneyland area and its hotels into the Disneyland Resort and consists of five areas: Sunshine Plaza, Hollywood Pictures Backlot, The Golden State, A Bug's Land and Paradise Pier. Each area is meant to resemble various aspects of California, its culture, landmarks and history.
Source: Wikipedia - Disney's California Adventure Park