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The Gross Tar is one of the three major rivers that run through New Crobuzon, the combination of the River Tar and River Canker.


The Gross Tar picks up New Crobuzon's trash, sewage, and other debris as its constituent rivers flow through the city. This waste is carried through the Grain Spiral, an extensive agricultural area where much of the city's food is grown, and acts as fertilizer for the crops there. The Gross Tar ends roughly ten miles from the city, at the Iron Bay, where it lets out into the ocean.

Notable islands[]

New Crobuzon's government compound, Strack Island, is located at the confluence of the Tar and Canker into the Gross Tar. The waters around the island are extensively patrolled by Vodyanoi militia.