Victoria Harbour is a natural landform harbour separating Hong Kong Island in the south from the Kowloon Peninsula to the north. The harbour's deep, sheltered waters and strategic location on the South China Sea were instrumental in Hong Kong's establishment as a British colony and its subsequent development as a trading centre. Throughout its history, the harbour has seen numerous reclamation projects undertaken on both shores, many of which have caused controversy in recent years. Environmental concerns have been expressed about the effects of these expansions, in terms of water quality and loss of natural habitat. It has also been proposed that benefits of land reclamation may be less than the effects of decreased harbour width, affecting the number of vessels passing through the harbour. Nonetheless Victoria Harbour still retains its founding role as a port for thousands of international vessels each year. The harbour is a major tourist attraction of Hong Kong. Lying in the middle of the territory's dense urban region, the harbour is the site of annual fireworks displays and its promenades are used as gathering places for tourists and residents.