The Heart of the Wild is a resource for The One Ring Adventures Over the Edge of the Wild describing the lands of the River and the Forest, the Vales of Anduin along the banks of the Great River, and the trackless forest of Mirkwood to the east. It expands on the descriptions given in the Loremasters Guide, offering new sanctuaries and new perils for the players to discover. Each region is described in detail, listing potential friends and foes, sites of interest and potential adventures.