Humpty Doo is a small town in Australia's Northern Territory, situated just south of the Arnhem Highway, approximately 40 km from Darwin. At the 2016 census, Humpty Doo had a population of 4,380 people. The town is a popular stopping point for tourists travelling between Darwin and Kakadu National Park, and boasts many attractions of its own. The main industries are agriculture and tourism; however, most residents commute to Darwin or Palmerston for work, and many regard it as a dormitory town.

The town's name It has frequently been noted on lists of unusual place names. The locality of Humpty Doo is named after the station originally called "Umpity Doo"; however, origins of the name are uncertain.

The Humpty Doo Hotel is well known and features in several bush ballads, including "The Man from Humpty Doo" by Ted Egan and "Humpty Doo Waltz" by Slim Dusty. It opened in 1971, survived Cyclone Tracy in 1974 and has since become a local icon.

Another tourist attraction is the Big Boxing Crocodile outside the United fuel station (formerly known as the Bush Shop) on the Arnhem Highway. This humorous attraction is a reference to the large crocodile population in the area and is one of the many famous "big things" found around Australia.

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