Tokyo DisneySea is a 176-acre (712,246 m²) theme park at the Tokyo Disney Resort located in Urayasu, Chiba, Japan, just outside Tokyo. It opened on September 4, 2001. It is owned by The Oriental Land Company, which licenses the theme from The Walt Disney Company. Tokyo DisneySea attracted an estimated 12 million visitors in 2009, making it the fifth-most-visited theme park in the world. Tokyo DisneySea has an overall nautical exploration theme to it. The idea for the park can be traced to a proposal to build a second theme park in Southern California called "DisneySeas" in Long Beach, California. However the idea was scrapped after the company endured financial trouble with the Euro Disney project. Later the idea was passed on to the Oriental Land Company to expand their resort. Unlike Tokyo Disneyland, the overall intention was to create a more adult-themed park, including faster, scarier rides and shows designed more for an older audience. By the time Tokyo DisneySea opened in 2001, its concepts and designs had been in development at Walt Disney Imagineering for well over 20 years. There are seven uniquely themed areas or "ports of call". The entrance to the park is Mediterranean Harbor, which opens up to six more nautically themed ports: American Waterfront, Lost River Delta, Port Discovery, Mermaid Lagoon, Arabian Coast, and Mysterious Island.