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October 2nd, 2026
Daily puzzle · Easy · Streets map
Theme: Volcanoes That Formed Entire Lakes in Their Craters
When a volcano collapses or blows its summit apart, the resulting caldera can fill with rainwater and snowmelt to form a startlingly blue lake. Crater Lake formed this way after Mount Mazama's eruption nearly 8,000 years ago, while Indonesia's Kelimutu is famous for three such lakes that each shift color independently. Toba's eruption was so immense it created the world's largest volcanic lake, and Pinatubo's 1991 blast left behind a crater lake that continues to grow each year. Taal, meanwhile, hides a lake within a lake, on an island that itself has an island at its center.
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Crater Lake, OregonThis deep blue lake fills the caldera left by the collapse of ancient Mount Mazama.
2
Lake Toba, IndonesiaThis massive lake in Sumatra occupies the caldera of one of history's largest known volcanic eruptions.
3
Taal Volcano, PhilippinesThis volcano sits on an island within Taal Lake and contains its own crater lake.
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Kelimutu, IndonesiaThis Flores Island volcano holds three crater lakes known for changing colors over time.
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Mount Pinatubo, PhilippinesThis volcano's 1991 eruption left a caldera that later filled to form a crater lake.