の方言

dialect of

→ の
phrase Rare #33,133
dialect of の marks what the dialect belongs to or is associated with, such as a language, region, or group.
JA: これは大阪の方言です。
EN: This is an Osaka dialect.

厳密に言えば中国語何百の方言から成り立っている

Strictly speaking, Chinese consists of hundreds of dialects.

その言語学者いくつかの中国語の方言流暢に話す

That linguist speaks several Chinese dialects fluently.

それはこの辺りの方言じゃない

Isn’t that a dialect from around here?

— 君の名は。 (2016)

彼らは南部の方言話していた

They were speaking in a southern dialect.

これはスコットランドの方言書かれたです

This is a poem written in a Scottish dialect.