How much land to feed a city of 30,000 people

A city of 30,000 people, climate by climate: the countryside its grain comes from and how far a cart must haul it, inland and on a river. About the size of Toulouse around 1300.

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Away from water, it needs the least land in the flooded grassland (1,500 km², 1 day by cart) and the most in the barrens (190,000 km², 10 days). Its grain comes within a day's cart in 1 of 13 climates away from water, and in 3 on a river.

ClimateInlandOn a river
Tropical Rainforest24,000 km², 3.5 days24,000 km², 2 days
Tropical Dry Forest6,100 km², 2 days6,100 km², 1 day
Temperate Forest6,800 km², 2 days6,800 km², 2 days
Temperate Conifer Forest26,000 km², 4 days26,000 km², 2.5 days
Taiga55,000 km², 5.5 days55,000 km², 3 days
Savanna9,400 km², 2.5 days9,400 km², 1.5 days
Grassland6,700 km², 2 days6,700 km², 1.5 days
Flooded Grassland1,500 km², 1 day1,500 km², 0.5 days
Alpine Meadow57,000 km², 5.5 days57,000 km², 3.5 days
Mediterranean Scrub7,600 km², 2 days7,600 km², 1.5 days
Hot Desert5,200 km², 2 days5,200 km², 1 day
Cold Desert50,000 km², 5.5 days50,000 km², 3 days
Barrens190,000 km², 10 days190,000 km², 5.5 days

1,000, 3,000, 10,000, 100,000, 300,000, 1,000,000

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