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Flying over southern Oregon or northern California, I saw these strange shapes. They look like burial mounds but are much much bigger...

Mysterious craters

Can anyone tell me what they are?

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Volcanic craters, most likely. The Cascades are mostly volcanic, after all.

You can see some similar-looking volcanoes here, just east of Lassen Volcanic National Park. And lots more near Lava Beds National Monument. And yet more... They are easier to spot in terrain view than satellite.

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