From PathfinderWiki

The Thinlands are a span of forest in the River Kingdom of Sevenarches that appear only as shadows of trees that otherwise are not there. Creatures from the First World occasionally break through the thin barrier here between that plane and the Material Plane.[1][2]


  1. Jeff Quick. (2010). Sevenarches. Guide to the River Kingdoms, p. 49. Paizo Publishing, LLC. ISBN 978-1-60125-203-6
  2. Tim Akers et al. (2014). People of the River, p. 14. Paizo Inc. ISBN 978-1-60125-666-9