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all the way ... (to this remote place); as far as ...
「下り」 has another reading with different meanings.
用事があって東京くんだりまでわざわざ来ました。
I came all the way to Tokyo.
こんな田舎くんだりまで来てくれたのか?
You came all the way out to the middle of nowhere?
東京くんだりまで行く必要はなかった。
There was no need to go all the way to Tokyo.