Source du Tonnelet (Spa)

The Source du Tonnelet in Spa, Belgium, is one of the chain of naturally carbonated ferruginous mineral springs in the Ardennes hills above the town that gave the English language the word 'spa', and that attracted an extraordinary parade of European royalty and aristocracy from the 16th through 19th centuries. The Tonnelet spring, like its famous neighbours, produces naturally sparkling water rich in iron and carbonic acid, with a distinctive metallic taste that connoisseurs of Belgian mineral water have appreciated for centuries. The spring's location in the wooded hills of the Hautes Fagnes-Eifel natural park, combined with Spa's extraordinary cultural legacy as Europe's original health resort, makes the Tonnelet walk one of the most historically resonant heritage routes in the Benelux.