Lake Claire is the largest lake located entirely within Alberta, Canada, covering an impressive 1,436 km² (554 sq mi) with a maximum length of 59 km (37 mi) and maximum width of 45 km (28 mi). Situated entirely within Wood Buffalo National Park in the remote northeast corner of the province, the lake sits at an elevation of 213 m (699 ft) and forms a central component of the renowned Peace-Athabasca Delta system — one of the world's largest freshwater deltas. The lake is fed primarily by the Birch River and McIvor River, and its waters ultimately discharge into the Peace River, eventually reaching the Arctic Ocean via the Slave River, Great Slave Lake, and Mackenzie River. The lake system also connects with Baril Lake and Mamawi Lake, forming a rich and ecologically significant aquatic network. Lake Claire has a deep-rooted fishing culture, with generations of anglers — including many Indigenous families local to Alberta — who have fished these waters and passed down their traditions over time. The lake's remote setting within a national park, combined with its sheer size and ecological richness, makes it a truly unique destination for anglers seeking a wilderness fishing experience in northern Alberta.