The Thirty-Eighth Parallel South is a circle of latitude that is 38 degrees south of the Earth's equatorial plane. It runs through several countries, including Australia, New Zealand, and Chile. This latitude is significant in geography and climate studies, as it often marks the boundary between different climatic zones. In historical contexts, the Thirty-Eighth Parallel is more commonly known for its association with the Thirty-Eighth Parallel North, which divides North Korea and South Korea. However, the southern parallel also plays a role in various ecological and environmental studies, influencing weather patterns and biodiversity in the regions it traverses.