Tourists at Oshino Hakkai, a Mt. Fuji spring pond area, allegedly threw 18,000 coins in 2025 despite posted signs, raising environmental concerns

The article warns that Oshino Hakkai’s UNESCO spring ponds are facing an environmental crisis as visitors reportedly ignore warning signs and toss coins into the water. It says corrosion could threaten the clear waters fed by Mt. Fuji snowmelt.