The Fen River is a major river in northern China, flowing through the Shanxi province. It is approximately 600 kilometers long and is a tributary of the Yellow River. The river plays a crucial role in the region's agriculture and water supply. The Fen River originates from the Lüliang Mountains and flows northward, passing through several cities, including Taiyuan. It is known for its scenic beauty and cultural significance, with many historical sites located along its banks. The river's basin supports various ecosystems and is vital for local communities.