The Forest Service is protecting the area from too much human activity so it will return to its natural wild condition.

VOA: special.2009.07.20

Agriculture was overwhelmingly the activity, the most important activity of the people of that area, of any area.

绝大多数经济活动是农业活动,农业对该地区,甚至任何地区的人民来说,都是最重要的活动

耶鲁公开课 - 古希腊历史简介课程节选

Furnace Creek is the largest area of human activity within Death Valley National Park.

VOA: special.2009.08.26

In other words, the U.S. failed to isolate Iran from diplomatic activity in the area.

NPR: President Bush Airs His Ideas About Iraq and Iran

Additionally there was no other information to indicate the presence or otherwise of activity in the area.

BBC: Airliner 'had narrow miss with UFO'

Tourism is a major activity in the area with about 1, 5 million national and 3, 000 foreign tourists (1997).

UNESCO: Biosphere Reserve Information