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> And I don't see Africa at all

That would be because Africa isn't a country. Look in the bottom center of the visualization: MAR, NGA, EGY, ZAF and a number of smaller countries between them - that's Africa.

Yeah, Canada is only 34 mln population! I was really shocked when I learnt that recently.

Fun fact: over 80% of Canadians live within 100 miles of the US border.

Sweden is the same as Canada, highly connected but large unpopulated areas