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Shrimp Worlds refers to two dimensions, which are primarily identified by the amount of shrimp which live there. Specifically, these two dimensions are:
- World Without Shrimp is a quiet little agrarian world, with little unusual properties except the absence of shrimp.
- World With Nothing But Shrimp contains literally nothing other than shrimp and as a result is sometimes considered boring.
The two dimensions can be used to illustrate the concept of alternate dimensions.
When Illyria talked about moving between dimensions, she said that she went to the World With Nothing But Shrimp but "tired of it quickly". She later lamented being unable to travel between dimensions and missing the dimensions, "even the one made of shrimp."
Other Mentions of Shrimp
- Anya said that Xander "doesn't travel well, like fine shrimp".
- Willow found a spell to “communicate with shrimp”. 
- After Anya mentioned the World Without Shrimp, Tara replied that she was allergic to them.
- "Graduation Day, Part One" (Only mentioned)
- "Superstar" (Only mentioned)
- "Triangle" (Only mentioned)
- "Spiral" (Only mentioned)
- "Underneath" (Only mentioned)