Shanghai is located on an alluvial plain. As such, the vast majority of its land area is flat, with an average elevation of . Tidal flat ecosystems exist around the estuary, however, they have long been reclaimed for agricultural purposes. The city's few hills, such as She Shan, lie to the southwest, and its highest point is the peak of Dajinshan Island () in Hangzhou Bay. Shanghai has many rivers, canals, streams, and lakes, and it is known for its rich water resources as part of the Lake Tai drainage basin.
Shanghai is located on an alluvial plain. As such, the vast majority of its land area is flat, with an average elevation of  Tidal flat ecosystems exist around the estuary, however, they have long been reclaimed for agricultural purposes The city's few hills, such as She Shan, lie to the southwest, and its highest po.int is the peak of Dajinshan. Island () in Hangzhou Bay. Shanghai has many rivers, canals, streams, and lakes, and it is known for its rich water resources as part of the Lake Tai drainage basin.