These five beautiful lakes — Superior, Michigan, Huron, Erie, and Ontario — are celebrated on Great Lakes Awareness Day, which takes place on the Monday in the first full week of May. This year, it takes place on May 1. This event is the United States’ chance to honor this series of large interconnected freshwater lakes that (mostly) border us. Celebrations on this day have also taken on themes like water conservation, lake preservation, and other current issues and have included participation by aquariums, schools, governing bodies, and even museums. The annual observation started as a protest against the advancement of the dangerous Line 5 pipeline passing through Lake Michigan and Lake Huron. Since 2018, the day is about raising awareness regarding the grave issues that threaten the freshwater ecosystem of the Great Lakes.