Final answer:
The Springfield Tar Pits are a fictional tourist attraction in The Simpsons and are typically billed as such. The 'billing' could also refer to the financial aspect of visiting such a landmark, through entry fees and other related costs.
Step-by-step explanation:
The Springfield Tar Pits are a fictional location often referred to in the animated television series The Simpsons. In the context of the show, they are usually billed as a local tourist attraction or natural landmark within the fictional town of Springfield. These tar pits may be showcased in a humorous or educational light, depending on the episode. If you're asking about how they are 'billed' in terms of finances on the show, it isn't specific; however, attractions like tar pits in real life can be billed through entrance fees, merchandise sales, or educational tour fees.