The most populated was La Thona where the inhabitants quite logically built their farms on the Adret, the sunniest side of the valley. It was dependent on the Commune of Megève and its agricultural activity was limited to daily tasks indispensable for survival. Then in 1834, Praz declared its independence but only obtained it in 1869 because of problems related to the dividing up of the land. Nowadays the Tonnaz hamlet is one of Praz sur Arly's most important heritage sites and it will delight lovers of traditional regional architecture.
- Historic site and monument
Hamlet Tonnaz
The village of Praz sur Arly was originally made up of three hamlets, called "dîmeries": La Thona, Réon and the Pratz de Megève.
