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According to the ipadic attached to [Mecab](https://code.google.com/p/mecab/),
it's "so u ru".

According to the bccwj dict attached to
[Julius](http://julius.sourceforge.jp/), it's "so: ru". Which one is correct?
Or are they both OK?
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pronunciation long-vowels
Should 「ソウル」 be pronounced as "so u ru" or "so: ru"?
ソウル (Seoul) is pronounced Souru. There's a long O sound in the "So" which is
written in English as either Souru or Sōru.
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ソウル is the pronunciation given in the NHK日本語発音アクセント辞典, but both pronunciations
are in use; some speakers pronounce it ソール instead.

From _The Sounds of Japanese_ (Vance 2008), pages 67-68:

> Katakana spellings of recent borrowings and foreign proper names with ウ (
> _u_ ) instead of ー (the length mark) do represent /ou/, but these are rare;
> _Souru_ ソウル 'Seoul' in Table 3-8 is one of very few examples (and many
> speakers do have the pronunciation /soHru/ rather than /souru/).37

From footnote 37:

> 37The entry in Kindaichi and Akinaga 2001 gives ソウル (implying /ou/) first
> but also gives ソール (implying /oH/). NHK 1998:1015 gives only ソウル in its list
> of foreign place names.

Note: the /H/ symbol in phonemic transcriptions indicates a long vowel.
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The pronunciation closest to Korean is So-ul, with an open o, u sound as in
'tour' and unreleased final consonant, to match 서울. So the closest in Japanese
would be ソ・ウル, losing the close/open o distinction, the u/e distinction and
unreleased 'l' (the l/r is the same in Korean and Japanese though).
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