Shanghai is China's most comprehensive industrial and commercial city, ranking the first in population and population density. As a tourist city, it attracts travelers from both home and abroad by its commercial activity rather than scenic beauty. Shanghai is situated on the bank of the Yangtze River Delta, with East River in the east and Hangzhou delta in the south. Now currently supporting a gigantic population, it was once a small town supported by fishing and weaving before the first Opium War. Late in 1990, the central government started developing the area, and has since become the well-known booming metropolis city.