Odel,
We have reason to suspect there are three encampments nearby harbouring the manumits. We can’t be certain yet, but it’s critical that you keep these areas under close watch.
First one: go up the river until you reach its fork. It’s a little south-east from there, near the Middens.
Second one: once you reach Tantari’s watermill, cross to the other side of the river. The camp is nested between the rocks.
Third one: you’ll find it in the south-western part of the Silts, they’re hiding near the swamps.