Why were port facilities developed at Dagu and Tanggu?

Port facilities were developed at Dagu and Tanggu primarily because of shifts in regional geography and transportation infrastructure during the 19th century.

As the Grand Canal became silted up in the early 1850s and the Huang He shifted its course, inland waterway traffic through Tianjin was significantly restricted. Consequently, shipping operations were relocated eastward along the banks of the Hai River, leading to the construction of facilities at the river's mouth at Dagu and Tanggu. By 1900, these developments helped establish Tianjin as an important ocean shipping center.1

Today, Tanggu continues to serve as an essential outport for Tianjin, and the New Harbor located at the Hai River estuary is recognized as one of the largest container ports in China.2