suffix
all the way to (a remote place); as far as
Suffix attached to a place name, often with a nuance of going far from the capital or a central area. Used in a somewhat colloquial or emphatic way.
彼は北海道くんだりまで引っ越した。
He moved all the way to Hokkaido.
わざわざ東京からそんな田舎くんだりまで来たの？
Did you come all the way from Tokyo to such a remote countryside?
まで is a neutral particle meaning 'until' or 'as far as'. くんだり adds a nuance of remoteness or going far from a central point.
Derived from 下り (くだり, 'going down'), with a sound change to くんだり. The exact historical development is uncertain, but it likely originated from the idea of going down from the capital to remote provinces.