Khromark

The Khromark was a river located in eastern Sapphros. Originating in the highlands of Arqozath, it wound its way through Qoza and emptied at the Rainbow Delta into Tharza's Bight. Its name (lit. "color-tail" in Draconic) referred to the river's chromatic hue, dyed by the plants – weld, indigo, tumeric and more – that grew along the riverbed.
The river's natural dyes were the primary export of both the city of Qoza and the dracostate of Arqozath.