It bridges the Yongding River , a major tributary of Hai River .
The Marco Polo Bridge or Lugou Bridge is a stone bridge located 15 km southwest of Beijing city center in the Fengtai District .
Marco Polo Bridge bridges the Yongding River , a major tributary of Hai River .
The Marco Polo Bridge or Lugou Bridge is a stone bridge located 15 km southwest of Beijing city center in the Fengtai District .