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Both Shenzhen and Macau are easily accessible from Hong Kong via local mass transit (ferry and rail). Shenzhen also has a separate airport. For visitors from many countries, one can obtain a five-day “Visa on Arrival” (VOA) for visitation to Shenzhen. Click here for further information: https://www.travelchinaguide.com/cityguides/guangdong/shenzhen/visa-on-arrival.htm