The Thirty-Ninth Parallel South is a circle of latitude located 39 degrees south of the equator. It crosses several countries, including Australia, New Zealand, and parts of South America. This parallel is significant for geographical studies and climate patterns, as it often marks the boundary between different ecological zones. In Australia, the Thirty-Ninth Parallel South runs through regions like Victoria and South Australia, influencing local weather and agriculture. In New Zealand, it crosses the South Island, affecting the landscape and biodiversity. This latitude serves as a reference point for navigation and mapping across the Southern Hemisphere.