[wigl]

Not sure about the Russia and China routes but the Busan-Shimonoseki ferry is pretty impractical. 13 hrs and about as expensive as a flight. More if you consider train costs from Shimonoseki.

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Busan-Fukuoka ferries go directly between two huge cities and are priced competitively, particularly if you get a cabin instead of paying for a hotel.

[wigl]

Wow the JR Beetle is super fast! Didn't know about that, my knowledge is pretty old, thanks!