Darwin Harbour

Darwin Harbour is the body of water close to Darwin in the Australian Northern Territory. It opens to the north at a line from Charles Point in the west to Lee Point in the east into the Beagle Gulf and connects via the Clarence Strait with the Van Diemen Gulf. It contains Port Darwin, which is flanked by Frances Bay to the east and Cullen Bay to the west.

It was named after the naturalist Charles Darwin who sailed with Robert Fitzroy on the ship HMS Beagle around parts of Australia. However, Darwin and Fitzroy sailed in 1836 from King George's Sound (Western Australia) directly to the Cocos-Keeling Islands, at the south coast of Java, and from there to Cape Town and back to England. They stayed thus away from Darwin Harbour by 3000 sea miles and did not know of its existence.

The climate of the Darwin Harbour region is monsoon tropical with two distinct seasons: the Dry and the Wet. The Dry lasts for 6 months between April and September with an average rainfall of 24 mm, whereas the Wet lasts between October and March with an average monthly rainfall of 254 mm/month (according to the Bureau of Meteorology, 1999). The majority of the rain falls between December and April. Runoff varies between 250–1000 mm. Riverine discharge is relatively low with the exception of the Blackmore River and Elizabeth River. Peak flow for these rivers occurs in February, respectively 605Ml/day and 389 Ml/day, after which it slowly decreases until July when there is no freshwater input into Darwin Harbour until the onset of the following wet season (Padovan 1997). Cyclone frequency is low to moderate.

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