The incident occurred on July 28, according to a July 30 post<\/a> in the public Facebook group \u201cYellowstone: Invasion of the Idiots,\u201d<\/a> where park lovers can share incidents of visitors defying park rules and common-sense safety protocols.<\/p>\n Photos of the incident included within the post show the unknown man stepping out onto a bacterial mat near the park\u2019s Grand Prismatic Spring. These mats are comprised of delicate living organisms and give the landscape its signature colorful appearance, per the National Park Service<\/a>.<\/p>\n The organisms \u2014 called thermophiles \u2014 grow and thrive in the intense heat of the park\u2019s thermal basin, and are incredibly sensitive to outside disturbances.<\/p>\n yellow stone national park invasion of the idiots\/Facebook<\/p>\n A man walks across off-limits bacterial mats in Yellowstone National Park<\/p>\n The man, who appeared to be picking up hats that had blown onto the mats, was seen walking on the nearby boardwalk with a woman when he exited the boardwalk and \u201cillegally and repeatedly\u201d walked \u201call over the bacterial mats,\u201d per the post.<\/p>\n PEOPLE reached out to Yellowstone National Park for comment on Saturday, Aug. 2, but did not receive an immediate response.<\/p>\n Walking on the mats is considered \u201cthermal trespassing,\u201d <\/a>and is punishable by fines, park bans and even jail time.<\/p>\n In 2024, a 21-year-old tourist was sentenced to seven days in jail and was banned from the park for two years after he walked off a designated visitor area to get closer to Steamboat Geyser, the world\u2019s tallest active geyser, according to The New York Times<\/a>.<\/p>\n The PEOPLE Puzzler crossword is here! How quickly can you solve it? Play now!<\/a><\/p>\n In 2020, two men were each sentenced to 10 days in jail, a fine of $540, five years of unsupervised probation and a five-year ban from the park for trespassing on the cone of Old Faithful Geyser, per a press release<\/a> from the National Park Service.<\/p>\n \u201cVisitors must realize that walking on thermal features is dangerous, damages the resource [is] and illegal,\u201d Chief Ranger Sarah Davis said in a statement at the time, per the release.<\/p>\n![\"yellow](\"https:\/\/www.newsbeep.com\/ca\/wp-content\/uploads\/2025\/08\/0069c109f29bdca9e197aaac373053b0.jpeg\"\/)
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