This is the 6976th most frequent Japanese word.
マリアナ
"マリアナ" (Mariana) refers to the Mariana Islands or the Mariana Trench.
In this sentence, 'マリアナ' refers to a person's name, likely used as a subject or topic.
マリアナはとても親切な人です。
Mariana is a very kind person.
Here, 'マリアナ' is part of the term 'マリアナ諸島,' referring to a geographical location, the Mariana Islands.
弟がマリアナ諸島に旅行に行きました。
My younger brother went on a trip to the Mariana Islands.
In this sentence, 'マリアナ' is part of the term 'マリアナ海溝,' denoting the Mariana Trench in scientific context.