The Schnee River is the large river that emanates from the Schnee Glacial Lake, flowing down the land from west to east, and is often considered the dividing line between the Northern and Eastern continents, as it cuts cleanly across the Brillia Snowfield, dividing the frozen landscape from the lush farmland of Yutatora.
Though never directly mentioned, it can be seen on the location map for Monster Farm Online during your time in the Plains of Yutatora.