Billy’s Belly
Billy’s Belly is the colloquial name for Anomaly W337, a pocket dimension located within the stomach of Bilious Bartholomew Wildehund. It is home to a lush, thriving ecosystem of sapient bacteria, viruses, fungi, and parasites who are amongst the most friendly folk you will find in any dimension—pocket or not. When Charlotte Goose was a prisoner there during the War of Western Aggression, her hosts welcomed her with open ar… well, not arms per se, so maybe with open appendages.
Geography
The dimension is a vast and relatively flat realm dominated by a thick mushroom forest. There is an acidic lake near the center which feels very sad about the harm it accidentally inflicts on creatures who don’t understand its composition, as well as a single ooze-filled mountain in the far north which erupts with alarming regularity.
Climate
Billy’s Belly is possessed of a tropical monsoon climate, with extraordinarily rainy wet seasons punctuated by pronounced dry spells.
Butterflies in the Sky
The skies of Billy’s Belly are patrolled by enormous butterflies which are attuned to the emotions of the dimension’s host body. While the butterflies provide naught but a gentle breeze on most days and in most situations, they are capable of creating freakishly strong winds when the Billy himself is feeling anxious or otherwise agitated. He will occasionally call on them with a huff and a puff in order to project a fraction of their power out into the world beyond.


I was just joking about a gut macro biome on the World Anvil surprise Friday stream, and here it is! Amazing! I love how you're retro-engineered Billy's bilious belches!
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Hehehehe, yes indeedy!