Natural caused fire in Kobuk Valley National Park is allowed to burn if it is not threatening any property or villages. The dark patches of tundra show where the fire burned earlier.  Aerial view of smoke from active fires and dark tundra already burned.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/41585865@N06">Western Arctic National Parklands</a>
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/nps_wear/8490149805/">Natural Fire Event</a>