👉 Southernia is a geographical region in South America, encompassing parts of Argentina, Chile, Paraguay, Uruguay, and Bolivia. It was historically known as Rio de la Plata or "The Plateau," named after a river that flows through it, but today it is recognized for its diverse landscapes including mountains, deserts, and wetlands. This region has a rich cultural heritage, with influences from indigenous peoples, European explorers, and the Spanish colonial period.