Let's exercise some critical thinking skills.
What does the "N" in "UN" stand for?
That's right. The "N" stands for "Nation."
What is represented on the UN map?
Nations are represented on the UN map.
What continent is NOT a nation that is also NOT featured on the map?
THAT'S RIGHT. ANTARCTICA IS NOT A NATION, THEREFORE IT IS NOT REPRESENTED AS A NATION ON THE UNITED NATIONS MAP.
Now, fuck off and read a book.