Spiraeas (Spiraea)

Spiraea is a genus of about 80-100 species of shrubs in the family Rosaceae. **They are native to the temperate Northern Hemisphere, with a major concentration in eastern Asia.**

Therefore, the most likely geographical location or native region of *Spiraea* plants is:

* **Eastern Asia:** Countries like China, Japan, and Korea are home to many different Spiraea species.
* **Temperate Northern Hemisphere:** This includes parts of Europe and North America, though Asia has the highest diversity.

So, while found in other temperate northern regions, **Eastern Asia is the most accurate answer due to the high concentration and diversity of species found there.**