The 20th Parallel South is a circle of latitude located 20 degrees south of the Earth's equator. It runs across several countries in the Southern Hemisphere, including parts of Brazil, Africa, and Australia. This parallel is significant for geographical and climatic studies, as it often marks the boundary between different climate zones. In terms of biodiversity, regions along the 20th Parallel South can host a variety of ecosystems, from tropical savannas to arid deserts. This latitude also influences agricultural practices, as the climate can vary significantly, affecting crop growth and farming methods in areas like Namibia and Argentina.