The Ustradi River begins in the Shattered Range within the magic-blasted Mana Wastes, flowing gradually northward into Nex before meeting the Elemion River and emptying into the Obari Ocean at Quantium. At the Hellfallen Cliffs, where the industrial city of Alkenstar City stands, the river plummets over seven hundred feet over the edifice in the impressive Alken Falls.
The river has been prone to exude poisonous vapours and shimmer in strange colours from time to time, due to the mutating effects of the Mana Wastes. Perhaps more disturbingly, it is not uncommon for bizarre creatures and curious shaped things to be sighted floating downriver.
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- Erik Mona et al. (2008). Campaign Setting, p. poster map. Paizo Publishing, LLC. ISBN 978-1-60125-112-1
- Erik Mona et al. (2008). Campaign Setting, p. 59. Paizo Publishing, LLC. ISBN 978-1-60125-112-1
- James Jacobs et al. (2011). The Inner Sea World Guide, p. 110. Paizo Publishing, LLC. ISBN 978-1-60125-269-2