A sub-topic to #16: Food.
What are the commonly grown crops in your world? Tell me all the areas you thought of. Such as, in the north, the south, rural, urban, wetlands, desert, etc.
Who owns the farmland? The farmer? The lord? Government? King?
Do characters in your world keep livestock? If so, what do they keep? (This, I'm especially interested in for those of you who have a world consisted of only non-human characters.)
Are crops and livestock grown only for personal consumption or do they sell these at markets as well? How is the food transported?

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Worldsmiths | Fantasy World-Building Resource Book
RandomThis is the ultimate fantasy world-building resource book. There are many topics for you to think about for your world! Climate, fashion, laws, even etiquette. Use this book to organize your information, think about topics you haven't thought of bef...