The turquoise waters of Ijen Crater, in #Indonesia🇮🇩, are the main highlight of this #Sentinel2🇪🇺🛰️ image from 15 May 🌋💧

While beautiful to look at, we wouldn't recommend a swim - the lake has a high concentration of hydrochloric acid (and its pH is almost 0!)

🐦🔗: https://n.respublicae.eu/CopernicusEU/status/1668559859313266689