The Shanghai Outer Ring Expressway (), designated S20, is a ring expressway that surrounds the inner districts of the city of

Shanghai Shanghai (; , , Standard Mandarin pronunciation: ) is one of the four direct-administered municipalities of the People's Republic of China (PRC). The city is located on the southern estuary of the Yangtze River, with the Huangpu River flow ...

China China, officially the People's Republic of China (PRC), is a country in East Asia. It is the world's most populous country, with a population exceeding 1.4 billion, slightly ahead of India. China spans the equivalent of five time zones and ...

. The different sections of the road have specific names in relation to the cardinal directions. For instance, the eastern portion of the expressway is named 上海环东一大道 (Huandong Avenue (No. 1), literally ''Eastern Ring No. 1 Avenue''), the western portion of the expressway is named 上海环西一大道 (Huanxi Avenue (No. 1), literally ''Western Ring No. 1 Avenue''), and so on. The S20 expressway crosses the

Huangpu River The Huangpu (), formerly romanized as Whangpoo, is a river flowing north through Shanghai. The Bund and Lujiazui are located along the Huangpu River. The Huangpu is the biggest river in central Shanghai, with the Suzhou Creek being its maj ...

twice. At the southern end, it uses the

Xupu Bridge The Xupu Bridge (), is a cable-stayed bridge over the Huangpu River in Shanghai, China, so named because it connects the city's Xuhui and Pudong districts. It opened in 1997 and carries 8 lanes of the S20 Outer Ring Expressway. See also * List o ...

, and at the northern end, it uses the Outer Ring Tunnel.