The Mstov River flows from the Kolyvan Mountains to Woden’s Sea along the north of Matriarchate of Periaslavl.
It is navigable for the vast majority of its length and is a prime trading route across northern Periaslavl.
Its delta on Woden's Sea is thick and challenging, however, and cannot be navigated by large ships. There is usually a thriving trade between Mstovgorod and Demmen of ships large enough to sail in Woden's Sea but small enough to navigate the delta.