In the Canadian Arctic, a singular body of water—an epishelf lake, formed in the rare and fragile space where glacier meets ocean—has drained away completely, taking with it the last of its kind on Canadian soil. These lakes are not merely geographical features but living thresholds, sustaining organisms adapted to conditions found nowhere else. Its disappearance is permanent, a door closed by the same warming forces reshaping the entire Arctic. What is lost here is not only a lake, but a category of existence that Canada will not see again.