Antarctic Circle
Antarctica
noun
Remember how 南極 means "South Pole" or the "Antarctic"? Add range onto that word and you get the region known as the Antarctic Circle.
This is a jukugo word that uses the on'yomi readings all three kanji. You've seen the vocab word 南極 before as well, so you should be OK with this one!
南極圏にはペンギン以外にも動物はいるんですか？
Are there any animals other than penguins in the Antarctic Circle?