Allumette Lake is a dramatic widening of the Ottawa River stretching approximately 70 kilometers in length along the provincial border between Ontario and Quebec, situated in Renfrew County near the towns of Pembroke and Petawawa. This expansive water body is one of the most significant geographical features of the Ottawa River system and encompasses several notable islands, including Allumette Island — the largest island in the entire Ottawa River system. The lake operates under a natural water regime with water level fluctuations of approximately 0.72 meters, distinguishing it from the reservoir-style management found in reaches further upstream. With its rich history dating back to early European exploration and Indigenous use by the Algonquin people, who knew it as Wadabidoc Okik, Allumette Lake offers a diverse and productive fishery set against a backdrop of deep cultural and natural heritage.