S21 Guangzhou–Huidong Expressway
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| Location | |
| Country | China |
| Province | Guangdong |
| Highway system | |
S21 Guanghui Expressway (simplified Chinese: 广惠高速公路; traditional Chinese: 廣惠高速公路; pinyin: Guǎnghuì Gāosùgōnglù) is a route that connects the cities of Guangzhou and Huizhou in the Chinese province of Guangdong.
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