Aerial photograph and thermal image of Tern Lake Yellowstone

Left: Aerial view of the new extension of the Tern Lake thermal area looking southwest. Note the steam in the central part of the image. Right: FLIR (Forward Looking InfraRed) image of the thermal area, with the field of view indicated by the red box in the visible aerial view. Warmest areas are bright white/yellow, while cooler areas are purple. Research conducted under NPS Geology Programs Milestones Permit 2016-9.