Hong Kong Harbor
A number of natural harbors surround Hong Kong Island, which is the best-known part of the Hong Kong region of China. The largest, naturally deepest, and most sheltered of these harbors is Victoria Harbor, which has an area of over 16 square miles (42 square km) and is situated between Hong Kong Island and Kowloon Peninsula. Other smaller harbors include Aberdeen Harbor, which separates Hong Kong Island from a satellite island, Ap Lei Chau. The margins of all these harbor areas have been artificially modified by the construction of concrete piers, seawalls, jetties, and other structures. This coastline can be classified as a secondary coast because it has been modified by living organisms, in this case, humans. In the whole of the Hong Kong region, more than 60 miles (100 km) of coastline have been artificially constructed or modified.