Hello Toritoribe さん,
Thank you for your very detailed and helpful reply.
1) I would use ヨーロッパの方に行く/日本の方に行く, not ヨーロッパへ行く/日本へ行く as in Tae Kim's example. ~の方へ is also possible, and I don't feel any difference between ~の方に and ~の方へ. へ indicates the destination in ヨーロッパへ行く/日本へ行く as same as に, imo.
Heh, I had already faintly suspected that the answer might be that the Japanese, instead of simple 「へ」, actually use a completely different construction to express the "direction towards" meaning. That is good information.
So the conclusion is that in this case there is really no information at all in the distinction between に and へ. And that when Japanese want to express clearly the meaning of "direction", they do not use the (supposed) difference between に and へ, but instead they use a completely different dimension, namely a different construction, namely 「xの方に」.
2) Yes. See examples quoted from a corpus.
That is impressive, with specification of the sources and all. (You give the impression that you must have somehow had that lying ready at your fingertips.) These examples are pretty convincing that one can indeed say 「東に行く」 without it sounding strange. Many thanks! どうも ありがとう ございます。 So my hypothesis that 「東に行く」 would sound strange is plain wrong.
I'm sending this reply at a point where I've quickly looked over everything and where I'm only about halfway through translating in detail all of the sentences (and halfway through wikipedia-ing to learn about the books they come from just out of curiousity).
3) に indicates the location of existence, not the direction, in that sentence. You can't use へ here.
Aha, so there does exist a definite clearly defined category of cases in which the choice of either に or へ does matter.
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Allow me to summarize as clearly and explicitly as I can what we've learned so far in this thread about に or へ, to check whether I've now understood things correctly. I'm taking the liberty to formulate my summary as a concrete "rule". (The "rule" is meant only in the sense of a temporary handhold -- we dummies who're new to a language occasionally need to formulate these, in order to advance into more nuanced language understanding.)
The rule is very simple. The only thing that one needs to do is to check what kind of verb is used in the phrase. We need to make a distinction between
(A) verbs that express static location in a place, such as "Bob is in the kitchen" or "The book lies in the middle of the table".
In phrases with this type of verb, only the particle に can be used, and へ is wrong.
(B) verbs that express movement, such as 「日本に行く」 or 「日本の方に行く」.
In phrases with this type of verb, the difference between に and へ is in effect nonexistent. In these phrases, native speakers use either particle indiscriminately, and neither particle sounds strange in these phrases.
Would that be a sensible rule, as a rough first guide, for a language learner new to the language?
If correct, then I think that this means that in fact one can always use 「に」. 「に」 is correct in all cases, and never sounds strange. It is only for the particle 「へ」 that a distinction must be made between verbs of static location (where へ is wrong) and verbs of movement (were へ is okay).
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So much for the concrete rules. Moving on to completely impractical academic "blue skies" philosophy, of course as always I have further questions (nonphilosophers please ignore the rest of this post) ...
The fact that へ can not be used with verbs of static location, how is that fact perceived from the viewpoint of a native speaker? Is it just a rule with no explanation? (as 99% of any language is --- such as for example in German many of the rules for the cases used with certain prepositions, which to native speakers are nothing more than automatic, arbitrary rules completely beyond any idea of "meaning" expressed by the cases). Or does the rule for へ have associations with the meaning that is perceived inside the particle 「へ」?
That is, does there adhere some *meaning* of movement to the particle 「へ」? (Movement in contrast to to static location, and probably without any meaning of "direction" associated with the movement.) And could に and へ be different in meaning, but only in this respect that へ does possess this association in meaning with movement, while in the particle に any association of the perceived meaning of the particle with either movement or static location is absent?
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With best regards,
Menno ( メンノー )