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In page Tianjin:

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The Tianjin Nangang Industrial Zone is a heavy and chemical industry base and harbor, a part of the"dual-city, dual-harbor" space development strategy of Tianjin, and a zone with a circular economy. The total planned area of Nangang Industrial Zone is 200 km2 (77 sq mi), of which the terrestrial area is 162 km2 (63 sq mi).[citation needed]