The Isle of Flies is the island in the Upper Reach, in the middle of the Blackwater river, that divides the Thunderfalls. It is covered by a single, massive banyan. The Oracles of the Marula believe that their god, the Darkness-under-the-trees inhabits the shadows of that tree
The Upper Reach is the are around the Thunderfalls, connected by an immense ladder to the Lower Reach, the land of the Marula. It is critical to the Oracles because it is where the Isle of Flies is, where their god, the Darkness-under-the-trees, resides
The Lower Reach is the land of the Marula. It is a narrow land, really not much more than the banks of the Blackwater river cleared back into the encroaching forest
The Oracles are the priests of the Marula god, the Darkness-under-the-trees
This is what the Marula call the god that they worship and whose priests are the Oracles
