This photo provided by Randy Shannon shows Mooney Falls on the Havasupai reservation outside the village of Supai, Ariz., May 19, 2024. Dozens of tourists say they fell ill on a recent visit to a popular and picturesque stretch of waterfalls deep in a gorge neighboring Grand Canyon National Park. (Randy Shannon via AP)
This photo provided by Francesca Dupuy shows the Havasu Falls on the Havasupai reservation in Arizona, Sept. 4, 2023. Dozens of tourists say they fell ill on a recent visit to a popular and picturesque stretch of waterfalls deep in a gorge neighboring Grand Canyon National Park. (Francesca Dupuy via AP)
This photo provided by Francesca Dupuy shows the Havasu Falls on the Havasupai reservation in Arizona, Sept. 4, 2023. Dozens of tourists say they fell ill on a recent visit to a popular and picturesque stretch of waterfalls deep in a gorge neighboring Grand Canyon National Park. (Francesca Dupuy via AP)