The opening may have a crater, more technically called a "caldera."
A bowl-shaped area that forms around a volcano's central vent is called a crater.
the bowl shaped opening of a volcanoe is a crater
Mount Taal is a cinder cone volcano because it has a bowl shaped crater.
A bowl-shaped crater opening
A bowl-shaped crater opening
A bowl-shaped crater opening
plat form
It is a valley
Basin that is the answer
Basin that is the answer
basin
Great Basin