Vichy, for one, is a SPA town in France. It is located in the Allier department of the Auvergne-Rhône-Alpes region and is known for its thermal springs. The SPA town has been a popular destination since the 19th century, when it was frequented by the French aristocracy. Today, Vichy is a popular tourist destination, offering a variety of SPA treatments and activities. The three letter solution to the crossword is SPA.