The Platinum River is a major river in Brightmarch. Beginning in the hilly interior around Sharruma, the river then flows north and west until it reaches the Gulf of Aserdus. The river is of critical importance to the city-state of Sharruma, which uses the river to transport the platinum and gold from its mines to its vassal port city of Ammuken. Though other peoples of Brightmarch live near and travel the river as well, Sharruma attempts to maintain control of the river's banks for much of its length.