This is the 6263rd most frequent Japanese word.
グンマー
"グンマー" refers to Gunma, a prefecture in Japan.
Here 'グンマー' is used as a proper noun referring to the prefecture Gunma in Japan.
グンマーは美しい自然が溢れている場所です。
Gunma is a place full of beautiful nature.
In this sentence, 'グンマー' indicates the destination of a question regarding travel experience.
彼はグンマーに行ったことがありますか？
Has he ever visited Gunma?
In this context, 'グンマー' is used to specify the origin of a person.