Map of major North American river systems in the style of underground transit maps. Perfect for the urbanite who cannot understand nature without it being put into more hip, more modern terms. 10% of profits from the sale of this item will be donated to organizations that protect and restore watersheds seen in this river map series. For more information on how this map was constructed, check out my blog post about the subject here. For detail images of this map and others in the series, look here.
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