The 66th Parallel is a circle of latitude located 66 degrees north of the equator. It runs through several countries, including parts of Norway, Sweden, Finland, and Russia. This parallel is significant because it marks the beginning of the Arctic region, where the climate becomes increasingly cold and harsh. In the Arctic, areas along the 66th Parallel experience phenomena such as the Midnight Sun and polar nights, where the sun does not set or rise for extended periods. This latitude is also home to unique ecosystems and wildlife, including species adapted to extreme conditions, like polar bears and arctic foxes.