The "Fifty-First Parallel" refers to the latitude line that is 51 degrees north of the equator. It runs across several countries, including Canada, the United Kingdom, and Germany. This parallel is significant in geography as it helps define borders and regions in the northern hemisphere. In Canada, the Fifty-First Parallel serves as a boundary between some provinces and territories. It also plays a role in climate and ecology, influencing the types of vegetation and wildlife found in areas along this latitude. The parallel is often used in mapping and navigation.