You may be thinking of the Antarctic Penninsula.
The country that extends farthest north is Norway, and the country that extends farthest east is Russia. Russia holds the title for being the country with the largest east-west extent.
Australia Wrong. Antarctica is the furthest south, it actually encompasses the South Pole. Of the others, South America stretches furthest south, not Australia. Look them up on a map.
Mongolia
The North American country that extends farthest East is Canada. The state of Maine in the United States is the most eastern state.
Norway and Iceland
If you mean the northernmost state then it is Alaska.
Norway
The farthest place north of the equator from the equator is the North Pole.
I believe you mean country and that is Russia.
The continent that extends the furthest west is North America. On the other hand, the continent that extends the furthest east is Asia.
Canada extends farthest east in North America, with Newfoundland and Labrador being the easternmost province.
The regions farthest north and south on the Earth are called the polar regions. Both the north and south polar regions have an icy coating. The north is called the North Pole and the south is called Antarctica. Antarctica is also a continent.