Caldeira Segara Anak, Volcanic caldera in Lombok, Indonesia.
Caldeira Segara Anak is a volcanic crater in Lombok containing a deep blue lake surrounded by steep rock walls at the base of Mount Rinjani. The crater is accessible only through multi-day treks with experienced guides.
The crater formed from a catastrophic eruption of Mount Samalas in 1257 that dramatically altered the landscape. This eruption reshaped the region and created the depression visible today.
The lake inside the caldera holds spiritual meaning for local Sasak communities, who perform ceremonies and leave offerings there regularly. These rituals remain an active part of how people connect with this place today.
The area is easiest to visit during dry months from April through December when weather is stable. Visitors should go with local guides since the trek spans multiple days and requires proper preparation.
Scientists traced volcanic ash deposits found in Greenland ice cores back to this crater's eruption. This discovery shows the explosion had global climate effects far beyond Indonesia.
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