Meaning and use of どの when not in a question


Can someone please help me to understand these sentences from the Tobira
textbook?

秋田市の「竿燈祭り」、仙台市の「七夕祭り」、そして青森市の「ねぶた祭り」。 **どの**
祭りもすごいスケール！毎年、日本だけじゃなくて、海外からも観光客がたくさん来るし、とても人気のある祭りだよ。

I am confused about this sentence どの祭りもすごいスケール！. I've never really understood
how どの is used outside of a question, so I'm not sure what it means here. I
think it might mean something like, each of (the three) festivals is very
large?

How specifically are どの and も functioning in this sentence?




「どの」＝「いずれの」 = " _ **each and every**_ (one of the items mentioned)"

> 「どの + Noun + も + Verb or Adjective Phrase」 =
>
> "Every (noun) [that have been mentioned] is/does ~~~."

This 「も」 does **not** mean "also". It expresses the _**complete kind of
affirmation or negation**_. In other words, it is saying that there is no
exception (to what one is saying).

> 「どの[祭]{まつ}りもすごいスケール！」 = "Each festival is of an awesome scale!"




「どの」＝「いずれの」 = " _ **each and every**_ (one of the items mentioned)"

> 「どの + Noun + も + Verb or Adjective Phrase」 =
>
> "Every (noun) [that have been mentioned] is/does ~~~."

This 「も」 does **not** mean "also". It expresses the _**complete kind of
affirmation or negation**_. In other words, it is saying that there is no
exception (to what one is saying).

> 「どの[祭]{まつ}りもすごいスケール！」 = "Each festival is of an awesome scale!"

