Yes, Crater Lake is located within the caldera of Mount Mazama, an extinct volcano in Oregon.

Here's a breakdown:

* Caldera: A large volcanic crater, usually formed by the collapse of a volcano's summit after a massive eruption.

* Mount Mazama: A large stratovolcano that had a catastrophic eruption around 7,700 years ago. This eruption caused the volcano to collapse, forming the caldera that now holds Crater Lake.

So, Crater Lake isn't just *on* a volcano, it's actually *inside* the collapsed remains of one!