Fertility

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Fertility is the measure of how fertile a tile is. In other words, it's the healthiness of the soil. The closer a tile is to naturally-placed water, the more fertile it will be. The higher the fertility, the more fauna can sustain itself there. It also controls how well farms yield crops, so players should always build farms on the most fertile land they can find.

There is no way to improve the fertility of any land. Even using the Dig Canal command to create more water will not improve fertility (but will still improve the irrigation factor for farms). Only water placed by the game improves fertility.