The course of the Bernier River generally descends to the southeast, in forest or agricultural areas.

The river surface is generally frozen from mid-December to the end of March.

Safe traffic on the ice is generally from late December to early March.

The water level of the river varies with the seasons and the precipitation.

The Bernier River rises at the mouth of Lake Martel (length: 0.5 kilometres (0.31 mi); altitude: 181 metres (594 ft)) in Saint- Boniface.