ormed from the confluence of the Brandywine and Dark Rivers, the Rilghorn River forms the primary waterway east for travelers on the Southern Road from Nevrast. Before branching into the Twisting Rapids and Rilghorn Tributary as it enters the Avenmore Mountains, it provides easy access to the Enchanted Forest and Castle Python; its two divisions merge further downstream into the Ishtar River, flowing past New Thalos before emptying into the Sea of Dragons.