This is the 12616th most frequent Russian word.
континентах
"Континентах" means "continents" (in the prepositional case, plural) in English.
Here, 'континентах' is used in the plural prepositional case, indicating 'on the continents' position.
На всех континентах Земли проживают люди.
On all continents of the Earth, people live.
In this case, 'континентах' appears in the prepositional case, describing the locations 'across the continents'.
Путешествуя по континентах, мы изучаем новые культуры.
Traveling across the continents, we study new cultures.
Here, 'континентах' is again in the prepositional case, referring to 'about the continents' in terms of the topic of the stories.