Nigeria at around 146 million.
The most populous nation in Africa is Nigeria, with 177 million people. The second most populous is Ethiopia with almost 87 million people.
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China is the most populated nation in the world.
The Pitcairn Islands have a population of around 50 making it the least populated jurisdiction in the world, although it is not a sovereign nation. The Vatican is the world's smallest and least populated country at about 920 people.
The fourth most populated country in the world is Indonesia, with an estimated population of over 240 million. Indonesia is the largest independent island nation in the world, and shares three of its islands with other countries. Borneo with Malaysia and Brunei, Timor with East Timor, and New Guinea with Papua New Guinea.
Indonesia.
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Russia,mongolia.
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The Vatican City.
The most densely populated sovereign nation is Monaco, with a population density of 16754.