Hikers' Boots Threaten 'World's Clearest Lake'

Nestled in New Zealand's Nelson Lakes National Park, Rotomairewhenua, or the Blue Lake, is celebrated for its unparalleled water clarity, allowing visibility of up to 80 meters. This natural wonder, sacred to the Ngāti Apa Māori iwi, is now at risk due to its growing popularity. Conservationists and the Ngāti Apa fear that increased visitor numbers could lead to the introduction of the invasive alga Lindavia, commonly known as 'lake snot.'

The spread of Lindavia, which excretes a slime that can obscure the water's clarity, is a primary concern. Scientists believe humans are the main vector for this organism, easily transmitted via contaminated boots or water bottles. Its presence, even in small amounts, could irrevocably alter the lake's ecosystem and mar its visually pristine state, which has drawn significant attention through social media.