The 35th Parallel North is a circle of latitude that is 35 degrees north of the Earth's equatorial plane. It runs across several countries, including parts of the United States, Mexico, Spain, and Japan. This latitude is significant in geography and climate studies, as it often marks the boundary between different climate zones. In the United States, the 35th Parallel North passes through states like California, Arizona, New Mexico, and Texas. It is also notable for its historical significance, as it has been used in various treaties and land surveys. The parallel serves as a reference point for navigation and mapping.