I think this is called Firehole Springs. It is on the Firehole Lake Drive at any rate. A common thermal feature of Yellowstone National Park, these boiling springs are fascinating. Dangerously so. You do not want to put your hand in there. Sony a6700 with the Tamron 50-400 Di iii VC zoom at 75 and 508 mm equivalents. Program mode. Processed in Photomator. Video assembled in LumaFusion and resized for upload in VDIT.