The Upper/Lower Red Lake watershed covers 1,263,678 acres. Located in Minnesota’s Northern Wetlands and Northern Lakes and Forest Ecoregions and a portion of the Red River Valley Ecoregion, this watershed is home to Upper and Lower Red Lakes, the two largest bodies of water within the state. The watershed is by both flow volume and surface area the largest drainage basin of the Red River.  Shotley Brook and the Tamarac River are the most prominent tributaries that flow directly into Upper Red Lake. Significant tributaries that flow directly into Lower Red Lake (from west to east) include the Sandy River, Pike Creek, Mud River, Hay Creek, Blackduck River, and Battle River.”