The Gulf Country or North West Queensland is the region of woodland and savanna grassland surrounding the Gulf of Carpentaria in north western Queensland and eastern Northern Territory on the north coast of Australia. The region is also called the Gulf Savannah. The Gulf Country is crossed by the Savannah Way highway.
The flat, savannah land has a dry season and a monsoon, containing the largest areas of native grassland in Australia. It is used for raising cattle and mining. It contains large reserves of zinc, lead and silver. The area is home to a number of endangered species and is crossed by a number of major rivers. The first known European explorer of the region was Willem Janszoon.
Location and description
The Gulf Country is a block of dry savanna between the wetter areas of Arnhem Land and the Top End of the Northern territory to the west and the Cape York Peninsula of Far North Queensland to the east, while to the south and east lie upland plains of Mitchell grasses and the Einasleigh Uplands. The Northern Territory side of the area is the Gulf Fall area of sandstone slopes and gorges draining the interior uplands into the gulf. The main land uses in the Gulf Country are beef cattle and mining.
The region covers an area of 186,000 km2 (72,000 sq mi).[1] The landscape is generally flat and low-lying tropical savannah cut through with rivers that carry the monsoon rains to the gulf and feed coastal mudflats and patches of rainforest. The Sir Edward Pellew Group of Islands and the Wellesley Islands lie off the gulf coast.
The climate is hot with a dry season and a monsoon. The dry season lasts from about April until November and is characterized by very dry southeast to east winds, generated by migratory winter high pressure systems to the south. The wet season lasts from December to March and is characterised by humid northerly monsoonal airflows. This wet season can be very erratic: at Burketown, which is typical of the region, the rainfall of various wet seasons has ranged from as little as 150 millimetres (5.9 in) to as much as 2,000 millimetres (79 in). Overall rainfall is low (from 750 mm on the coast to 500 mm inland) but if the wet season is at all strong, low-lying areas are flooded and even the few sealed roads are cut. The Gulf is also a breeding ground for cyclones during the period between November and April.
In September and October the Morning Glory Cloud appears in the Southern Gulf. The best vantage point to see this phenomenon is in the Burketown area shortly after dawn.
The region is source of great mineral wealth such as copper, zinc, lead and silver. Mount Isa Mines includes a number of copper, lead, zinc and silver mines in Mount Isa where production began in 1931. Century Mine, Australia's largest zinc mine began operations near Mount Isa in 1997 and is expected to be exhausted by 2016.[14] Other mines in the region include George Fisher mine, Cannington Mine and Hilton Mine.
Environmental concerns
Due to the lead production in the town, Mount Isa has one of the most intensive air quality monitoring systems in Australia.[15] Concerns have been raised over childhood lead contamination and air pollution within the region.[16][17]
Ecology
Flora
In the Gulf Country there are no mountains to restrict rainfall to the coastal band and the transition from the coastal mangroves through Acacia stenophylla woodlands to the arid scrubs of central Australia is gradual. There are up to nineteen important areas for bird migration in rivermouths along the gulf coast[18] including the Gregory River-Nicholson River estuary and the Roper River in Limmen Bight. The patches of rainforest habitat occur in parts that are less vulnerable to the grassland fires. On the savanna dicanthium bluegrass grows tall after the monsoon rains as the Gulf Country is one of the largest areas of native grassland in Australia.[19] The sandstone gorges of the Gulf Fall are home to a specific wildlife. Finally the Pellew Islands have retained original mangroves and thick woodland..
Fauna
The area is home to a number of endangered species including an endemic rodent, the Carpentarian rock rat(Zyzomys palatalis) and endemic reptiles such as the Carpentarian leristaskink . The mudflats and saltpans on the coast are home to waterbirds such as the magpie goose. One endemic grassland bird, the Carpentarian grasswren, is suffering as changing fire regimes (the way grasses are systematically burnt and allowed to renew) are reducing their habitat. The region is a hotspot for birdwatching.[20]
^"Rangelands Overview: Gulf Plains". Australian Natural Resources Atlas. Department of the Environment, Water, Heritage and the Arts. Archived from the original on 13 March 2010. Retrieved 31 January 2008.
^Environment Australia. 2001. A Directory of Important Wetlands in Australia, Third Edition. Environment Australia, Canberra, Australia.
^Australian Surveying and Land Information Group. 1990. Atlas of Australian Resources: Vegetation. Australian Government Publishing Service, Canberra, Australia