Alligator Rivers, three perennial rivers, northeastern Northern Territory, Australia, that empty into Van Diemen Gulf, an inlet of the Timor Sea. They were explored in 1818–20 by Captain Phillip Parker King, who named them in the belief that the crocodiles infesting their lower swampy, jungle-fringed reaches were alligators (actually, alligators are not indigenous to Australia). The South Alligator rises in the hills near El Sherana, a now-abandoned mining base for uranium, and follows a northerly course for about 100 miles (160 km). The East Alligator rises in Arnhem Land and flows northwesterly for nearly 100 miles; the West Alligator (50 miles [80 km]) generally parallels the course of the South Alligator. The region includes Kakadu National Park.
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