Where can I find a list of language + region codes?

Question

I have googled (well, DuckDuckGo\'ed, actually) till I\'m blue in the face, but cannot find a list of language codes of the type en-GB or fr-CA any

Answer 1

There are 2 components in play here :

1. The language tag which is generally defined by ISO 639-1 alpha-2
2. The region tag which is generally defined by ISO 3166-1 alpha-2

You can mix and match languages and regions in whichever combination makes sense to you so there is no list of all possibilities.

BTW, you're effectively using a BCP47 tag, which defines the standards for each locale segment.