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The Brown line is natural bluff line
The Blue is river. Light blue natural course of the tributary.
The Grey is a dam.
The White is the "old" city and "lower" city.
The Wheel is the new border of the city, Also know as "refugee" city.
The Spokes represent the placement of "boundary stones", a critic element to the shield being built.

This is meant to be a prospers fantasy city. My question is what scale should I use.