The Copernicus Sentinel-2 mission provided optical images of Kawah Ijen Crater Lake’s unique natural phenomenon.
- Location – East Java (Indonesia)
- World’s largest acidic lake (pH < 0.3)
- Known as ‘largest acid cauldron on Earth’ and has a volcanic origin.
- Source of the extremely acidic and metal-polluted river ‘Banyupahit’.
- Listed as a UNESCO World Biosphere Reserve
- It emits hot, flammable sulphurous gases that ignite upon contact with Earth’s oxygen-rich atmosphere and burn with an eerie, blue flame.