Imagen:Von Thünen circles city.svg

Vector image based on Image:Von_thunen_circles_city.gif by User:Bkwillwm, in turn based on the description on the Wikipedia article on von Thünen and Human Geography: Culture, Society, and Space by H.J. de Blij and B. Murphy (7th edition, 2003).

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Johann Heinrich von Thünen's model of agricultural distribution around a city in concentric circles. The dot represents a city. The white area around it (1) represents dairy and market gardening; 2) (green) the forest for fuel; 3) (yellow) field crops and grains; 4) (red) Ranching and livestock ;and the outer (dark green) region represents the wilderness where agriculture is not practised.