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haha Thank you you are very polite but dear blouen you don't need to say "thanks", I was just asking a question to Naamplao. Because, as you know my English is not very good. Just I needed a confirmation from a NES
Later edit: I realised you might have thanked Naamplao sorry
Isn't it depend on the context? Let's say if we are talking about a map, how will it be?
Can it be?;
When I was studying geography, I learnt that (x) city located on the east part of Korea on the map.
Again...it depends on where the city is. If you are referring to a city on the sea coast of the country or its border...then you use "on" but when you move into the body of the country then the preposition becomes "in".
It changes a bit if you were creating a map of the country. Then you would use the preposition "on" since you are physically writing on the surface of the paper. For example:
Where does Seoul go on the map?
It is in the eastern part of the country at longitude ##/ latitude ##.
Really these prepostion things are soo complicated. Thank you very much Naamplao for the answer. But I think it's almost impossible not to make mistakes, unless you are not a NES. It has many rules and each rule has exceptions. For eg. I couldn't catch any logic, why on campus but in University. So I kind of gave up about prepositions, and just beg to natives to tolerate me
in Korea 
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