The Forty-Third Parallel North is a circle of latitude that is 43 degrees north of the Earth's equatorial plane. It runs across several countries, including the United States, Canada, and parts of Europe and Asia. This parallel is significant in geography as it helps to define climate zones and ecosystems in the regions it traverses. In the United States, the Forty-Third Parallel North passes through states like Oregon, Idaho, Montana, and New York. It is often associated with various geographical features, such as the Great Lakes and the Rocky Mountains. The parallel serves as a reference point for mapping and navigation.