Tahiryuaq (formerly known as Ferguson Lake) is a vast, remote lake situated on the southern coast of Victoria Island in the Kitikmeot Region of Nunavut, Canada. Covering approximately 588 square kilometers (227 square miles) and sitting at a surface elevation of just 11 meters (36 feet) above sea level, this is a true wilderness fishery in one of the most isolated corners of the Arctic. The lake drains westward through the Iqaluktuuq segment of the Ekalluk River — a name that translates meaningfully to "place of big fish" — eventually reaching Wellington Bay and the Dease Strait of the Arctic Ocean. Classified as an oligotrophic lake, Tahiryuaq features cold, clear, nutrient-poor waters that are characteristic of high Arctic lake systems. The surrounding landscape has been described as polar semi-desert, with willow-sedge meadows, dryas uplands, and raised beaches framing the shoreline. This is a place of profound ecological and cultural significance, having supported Copper Inuit and their predecessors — the Dorset and Thule cultures — for thousands of years, with the lake's fish serving as a principal protein source throughout that history.