Here are some ways to express the concept:
* Cymru Fach: This literally means "Small Wales," and is a common way to refer to a small area with strong Welsh culture and language.
* Cymru Bychan: This means "Little Wales" and could be used in a similar way to "Cymru Fach."
* Lle Bach Cymreig: This literally means "Small Welsh Place" and emphasizes the Welsh character of the place.
The best way to use these phrases would depend on the specific context. If you are talking about a specific geographical area, you might use Cymru Fach or Cymru Bychan. If you are talking about a smaller community or cultural group, Lle Bach Cymreig might be more appropriate.
It's important to note that the use of these terms might be perceived as slightly patronizing by some, as they imply a comparison to the larger, "real" Wales.