Hong Kong is a densely populated city located in eastern China with over 7 million residents living within 1,104 square kilometers. It was a British colony until being returned to China in 1997 but maintains its own political and economic systems under the "one country, two systems" principle. The city is divided into 18 districts and has a highly developed free market economy. Hong Kong is famous for its cuisine, vibrant skyline of skyscrapers, vibrant culture and attractions like Victoria Peak and Hong Kong Disneyland. However, the dense population and extensive public transportation system also cause problems like traffic congestion. Maintaining Hong Kong's autonomy has also become challenging in recent years.