Nigeria's Osun river: sacred, revered and increasingly toxic

 Urban Alert conducted a series of tests on the Osun in 2021 and found it to be “heavily contaminated.” The report, which was shared with The Associated Press, found lead and mercury levels in the water at the grove that were, respectively, 1,000% and 2,000% above what’s permissible under the Nigerian Industrial Standard. Urban Alert attributes it to many years of mining activity, some of it within 30 kilometers (19 miles) from the river.

https://apnews.com/article/sacred-rivers-religion-osun-nigeria-2cb638faba9adffd33ce7170d4ce62f7