The largest city in South Central China. Guangzhou is the third largest city in the country behind Beijing and Shanghai. Located on the Pearl River, about 120 km (75 mi) north-northwest of Hong Kong and 145 km (90 mi) north of Macau. Guangzhou serves as an important national transportation hub and trading port. The city is probably best known for the Canton Fair, which is a comprehensive trade fair with the greatest business turnover in the whole of China. In 2015 Forbes ranked Guangzhou first among the top 100 best commercial cities on the Chinese mainland for three consecutive years.