The Profit's Flow is a river that runs most of its course through the nation of Druma in central Avistan. It begins in the western branch of the Five Kings Mountains, just north of the Isgeri city of Dustpawn. From there, it flows east through the Palakar Forest, joining with the Great Goldpan River at the town of Macridi. From there, it flows north out of the Palakar over the plain of Druma, finally emptying into the Gulf of Accord (part of Lake Encarthan) at the Drumish capital of Kerse. A group of Mephistopheles worshipers known as the Aerie Club maintains a retreat along the river's banks, where the normally secretive cult can worship openly.
- James Jacobs et al. (2011). The Inner Sea World Guide, p. 84. Paizo Publishing, LLC. ISBN 978-1-60125-269-2
- James Jacobs et al. (2011). The Inner Sea World Guide, p. 64. Paizo Publishing, LLC. ISBN 978-1-60125-269-2
- F. Wesley Schneider. (2016). "Mephistopheles, the Crimson Son". Breaking the Bones of Hell, p. 72. Paizo Inc. ISBN 978-1-60125-808-3