Hellmouth

"But if the Lord do a new thing, and the earth opening her mouth swallow them down, and all things that belong to them, and they go down alive into hell, you shall know that they have blasphemed the Lord." -- Numbers 16:30

Georgios Klontzas, 'Hellmouth', from the trypticon of the Last Judgment. See the whole of it here. Also, from Wikipedia, some more information about the Hellomouth, and a wonderful collection of images from the Monster Brains blog, where I found the image.