红河, or the Red River, is a major river in southern China and northern Vietnam. It flows through the Yunnan province and is known for its scenic landscapes and rich biodiversity. The river is approximately 490 kilometers long and plays a crucial role in the local economy, supporting agriculture and transportation. The Red River is also significant in Vietnamese history and culture, where it is called Sông Hồng. It has been a vital waterway for trade and communication for centuries. The river's basin is home to various ethnic groups, contributing to the region's diverse cultural heritage.