All continents have rivers, even Antarctica. Antarctica has only one river, Penguin River, but it does have a handful of creeks and streams.
Antarctica. It is not Australia, because Australia is a country itself. The Continent is Oceania which contains Australia, New Zealand, New Guinea, etc.
Antarctica has no capital city.
Antarctica
there are 31 main rivers in the continent of europe
Most of Australia's rivers are in the eastern third of the continent.
asia
All of them.
Asia
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The Mississippi and Missouri rivers are on the North American continent
africa
The Ob, Irtysh, and Huang He rivers belong to the continent of Asia. The Ob and Irtysh rivers run through Russia and China, while the Huang He (Yellow River) flows through China.
The Ob-Irtysh rivers are in Asia.
Po and Volga