Rumoi (capital) Mashike District Mashike Rumoi District Obira Teshio (Rumoi) District Enbetsu Teshio Tomamae District Haboro Shosanbetsu Tomamae The Rumoi River 44 kilometres (27 mi) flows from Mount Poroshiri in the Hidaka Mountain range to the Sea of Japan.
Rumoi (modal) Distrik Mashike Mashike Distrik Rumoi Obira Teshio (Rumoi) District Enbetsu Teshio Tomamae District Haboro Shosanbetsu Tomamae Sungai Rumoi 44 kilometer (27 mi) mengalir dari Gunung Poroshiri di Pegunungan Hidaka ke Laut Jepang.