The growing season length is about 120 days. This subsection is drained to the north and west. The major river is the Roseau River, which flows through the northern quarter of the subsection and then across the Canadian border. The drainage network is undeveloped. Rivers and streams commonly meander extensively.
Flooding can be a real problem due to level topography.
Lakes are rare. Floodplain forests of silver maple, elm, cottonwood, and ash occurred along the rivers and streams. In the north, extensive areas have been cleared for farming recently. Remnants of presettlement vegetation are more common and in larger blocks than many other subsections where agriculture is important. Other causes of disturbance are tornados and floods.