Suzhou generally refers to Suzhou city. Suzhou, known as Gusu and Pingjiang in ancient times, is a prefecture-level city under the jurisdiction of Jiangsu Province, an important city in Shanghai metropolitan area and Suzhou-Wuxi-Changzhou metropolitan area, one of the important central cities in the Yangtze River Delta approved by the State Council, a national high-tech industrial base and a scenic tourist city.