Puerto Williams is technically the southernmost city in the world, a title that is disputed by the larger Ushuaia, located on the opposite, northern side of the Beagle Channel. If you check the latitude Puerto Williams is actually a few minutes further south.
Great Zimbabwe is the furthest south of Benin City, Kinshasa, and Great Zimbabwe.
Cork.
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Cork is the city that is furthest south in Ireland, though there are many large towns that are further south than it.
Johannesburg is the furthest south of all listed cities. It is on the following coordinates: 26°12'16''S, 28°2'44'' E
There is only one national capital of the United States, Washington, D.C. But if you are referring to a state capital, then the furthest south would be Austin, Texas.
Wilmington, since it is furthest south and on the ocean.
Hawaii is the furthest south of all the U.S. states.
The Cordillera.
The capital city furthest north is Reykjavik in Iceland
The capital city furthest north is Reykjavik in Iceland