Hong Kong has been a part of China for 12 years, but its status as a special administrative region means it still maintains border controls on travel to and from mainland China.
The high frequency of crossings along this border, though, shows how deeply Hong Kong has become economically integrated with the mainland – specifically, with the Pearl River Delta (PRD) region of neighbouring Guangdong province.
Along with the San Ysidro Port of Entry linking the cities of San Diego in the US and Tijuana in Mexico, the Lo Wu Control Point between Hong Kong and Shenzhen is one of the world's busiest crossing points.
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