The West Branch Musquash River is a stream located in southwestern New Brunswick, Canada, flowing through a landscape that transitions from cleaner, less turbid upper reaches down toward the murkier lower sections near the main Musquash River and its estuary. Situated near the Bay of Fundy bioregion at approximately 45°11′N, 66°19′W, this river offers a diverse fishery that attracts anglers targeting multiple species in a relatively wild and natural setting. The upper and mid-reaches of the West Branch are notably clearer and less mucky than the lower main branch, making them the more productive and appealing stretches for freshwater fishing.