The Underland universe is the fictional reality in which Gregor lives. It is similar to our reality except that an enormous cavern below the crust of the earth, in which many organisms thrive, exists. It was created by Suzanne Collins and is showcased in the Underland Chronicles. A few of the more prominent locations in this universe are:

The Underland universe also contains some real places, such as New York City and Carnegie Hall.

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