This is the 13553rd most frequent Russian word.
находившиеся
"Being located" or "who were located."
Here, 'находившиеся' describes the people who were located in the hall at the time of the action.
Находившиеся в зале люди слушали лекцию с большим интересом.
The people who were in the hall listened to the lecture with great interest.
In this sentence, 'находившиеся' refers to the documents situated on the table during the mentioned event.
Документы, находившиеся на столе, были важными для заседания.
The documents that were on the table were important for the meeting.
Here, 'находившиеся' specifies the animals that were present in the forest during the situation.