口岸 kǒu’àn a port for external trade
a port for external trade; a trading or transit post on border between countries
How to remember 口岸: 口 mouth (Kangxi radical 30) + 岸 beach = a port for external trade.
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How it is used
- 'A port of entry / border trading post' - 通商口岸 (tōngshāng kǒu'àn) a treaty/trade port, 边境口岸 a border crossing.
- A trade/customs term for an official gateway where goods and people cross a national border; historically loaded (the treaty ports of the 19th century).