Which phrase helps the reader understand the meaning of the word notoriously in paragraph 4 of “A Rite of Passage (and the Importance of Penguin Etiquette)”?

Which phrase helps the reader understand the meaning of the word notoriously in paragraph 4 of “A Rite of Passage (and the Importance of Penguin Etiquette)”?

Roughest stretch of seas

Considered to be

To reach Antarctica

Violent area

The phrase "Roughest stretch of seas" helps the reader understand the meaning of the word notoriously in paragraph 4 of “A Rite of Passage (and the Importance of Penguin Etiquette)”.