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Topography
Tianjin is a typical estuary alluvial plain, which is part of the North China Plain. With a gentle terrain studded with lakes and ponds, most of it is three meters above sea level.

The Haihe, formed by the confluence of the Yongding, Daqing and Ziya rivers and the South and North canals, flows through the city and heads southeast towards Dagukou, where it empties into the Bohai Sea. The efforts to control this unruly river in the past decades have basically ridded Tianjin of the menace of floods.

(china.org.cn)

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