Сава is a river in the Balkans, primarily flowing through Slovenia, Croatia, and Serbia. It is approximately 940 kilometers long and is one of the major tributaries of the Danube River. The river plays a significant role in the region's ecology and economy, providing water for agriculture and supporting various wildlife habitats. The Sava River has historical importance, serving as a trade route since ancient times. It is also known for its recreational opportunities, including fishing, boating, and swimming. The river's banks are lined with cities such as Zagreb and Belgrade, which contribute to its cultural significance.