As the oldest colonized part of Hong Kong, its administrative and business centre, and site of some of the most expensive real estate in the world, Hong Kong Island is naturally the heart of the whole territory. Despite its tiny size, just 15 km from east to west and 11 km from north to south at the widest points, and the phenomenal density of development on its northern shore, the island offers a surprising range of mountain walks and attractive beaches, as well as all the enticements of a great city.