Kuwaiti oil fires
The Kuwaiti oil fires were caused by the Iraqi military setting fire to a reported 605 to 732 oil wells along with an unspecified number of oil-filled low-lying areas, such as oil lakes and fire trenches while retreating from Kuwait in 1991 due to the advances of US-led coalition forces in the Gulf War.
Source: Wikipedia, Kuwaiti oil fires. Text licensed CC BY-SA 4.0. Not endorsed by or affiliated with Wikipedia or the Wikimedia Foundation.