I was reading page 5 of my 上級へのとびら textbook, and in line 12, the following
sentence caught my eye:

> 日本は南北 **に** 長いので……

I cannot figure out why the に is used instead of が (南北が長い). Is に the 連用形 of なる
here?
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grammar particles particle-に
Particle usage of に in 南北に長い?
Turns a noun 南北 into an adverbial expression, i.e. answers the question "how?"
Let's say ..."north-south-directionally".

And the expression then modifies the adjective "long".

In English it would translate to "long in north-south direction".
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# 日本語

「日本は南北 **方向** に長い」という意味で「日本は南北に長い」と言います。 「東西に長い」も「東西 **方向**
に長い」の代わりにごく普通に使います。

# English

We usually say "日本は南北に長い" having a meaning of "日本は南北 **方向** に長い". In addition
to this, it is very common to use "東西に長い" in place of "東西 **方向** に長い".
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