Qualla: Lake Segara Anak

Lake Segara Anak: Introduction

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Midori, CC BY 3.0. The name says everything and nothing at once. Segara Anak -- "child of the sea" -- is what the Sasak people of Lombok call the blue crescent of water cradled inside a volcanic caldera two thousand meters above the Indian Ocean. The name captures the lake's impossible resemblance to the sea it can never touch: the same deep blue, the same vast expanse, but ringed by the jagged walls of a volcano that tore itself apart in 1257. That eruption, one of the largest in the last ten thousand years, erased an entire mountain from the skyline and may have helped trigger centuries of global cooling. What it left behind was this lake -- warm, gas-bubbled, sacred -- and a story written in ash and ice cores on every continent.

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Image: Midori | CC BY 3.0

Lake Segara Anak: The Mountain That Vanished

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Kembangraps, CC BY-SA 4.0. Before 1257, Mount Samalas rose an estimated 4,200 meters above sea level, dominating the northern spine of Lombok. Then it exploded. The eruption ejected roughly 40 cubic kilometers of dense rock into the atmosphere, collapsing the mountain into the caldera that now holds Segara...

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Image: Kembangraps | CC BY-SA 4.0

Lake Segara Anak: A Lake Heated from Below

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Midori, CC BY 3.0. Segara Anak sits at 2,004 meters above sea level, covering an area that stretches roughly 7.5 by 6 kilometers with a maximum depth of 230 meters. It is Indonesia's second-highest caldera lake with an active volcano. That volcano -- Gunung Barujari, whose cone rises to 2,376 meter...

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Image: Midori | CC BY 3.0

Lake Segara Anak: Fish Where There Were None

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Petter Lindgren, CC BY-SA 3.0. For most of its existence, Segara Anak held no fish at all. The volcanic lake, born from catastrophe and fed by geothermal heat, was a sterile body of water surrounded by some of the most dramatic scenery in Southeast Asia. In 1969, volcanologists from the Geological Society of L...

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Image: Petter Lindgren | CC BY-SA 3.0

Lake Segara Anak: Offerings to the Queen of Spirits

Thu, 02 Apr 2026 00:00:00 GMT

Photo credit Trekking Rinjani, CC BY 2.0. For the Sasak people and Balinese Hindus of Lombok, Segara Anak is far more than a geological curiosity. According to Sasak oral tradition, Mount Rinjani is the dwelling place of Dewi Anjani, the Queen of the Spirits and guardian of the island's natural world. Each year, during t...

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Image: Trekking Rinjani | CC BY 2.0