S21 (Guangdong)
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| Location | |
|---|---|
| Country | China |
| Province | Guangdong |
| Highway system | |
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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.