New Zealand may be the farthest country from Nigeria. But if you count any part of a country Hawaii is farther then New Zealand and it would make the U.S. the farthest country from New Zealand.
The farthest north country is Denmark (via Greenland). The farthest east country is Kiribati.
Norway and Iceland
Egypt. Egypt is the country which is the farthest east in North Africa.
In the United States Maine is the farthest state north on the main land. Alaska is the farthest state north in North America.
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Norway.
South Africa
From farthest south to farthest north: Alabama, Missouri, Wyoming, Michigan.
Norway
Mongolia
Rwanda is the African country to the north of Burundi
The North American country that extends farthest East is Canada. The state of Maine in the United States is the most eastern state.