is limited to the Pacific ocean in the East, the Blue mountains from the West, the Hawkesbury river in the North and the Royal national Park in the South. The coastline is indented with numerous bays and coves that were formed in the result of the fact that as the climate warms in the late glacial period and raising the level of the World ocean, the water flooded coastal river valleys and gorges of low mountains. Bay, Port Jackson, which includes Sydney harbour, Sydney harbour, is precisely such education and is the largest natural Bay in the world. On the territory of the residential areas of the city there are approximately 70 small bays and beaches, including the famous Bondi beach: Bondi Beach in the southern part of the city and manly beaches (English: Manly) in the North. Size of the residential areas of the city amounted, as of the 2001 year 1687 km2. However Bureau of statistics Sydney use in their estimates of a much larger area, including the Blue mountains, Central waterfront district and adjacent to the city's national parks. Thus, the total area of the greater Sydney is 12 145 km2.