Tiānjīn hé Dàlián dōu shì Huán-Bóhǎi de gǎngkǒu chéngshì.
Tianjin and Dalian are both port cities of the Bohai Rim.
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With the Yangtze River Delta (长三角) and the Pearl River Delta (珠三角) it is one of China's three big coastal economic regions. 环 means 'around', as in 环球 'round the world'.