Let's break it down:
* Vernoux: This is the name of the town.
* en: This preposition means "in" or "at."
* Gâtine: This refers to the geographical region of Gâtine, a historical and cultural area in western France.
Therefore, the full meaning is "Vernoux in the Gâtine."
It's similar to saying "Springfield in Illinois" or "Greenville in South Carolina."