Walker confirmed the Plan de l'Aar

The village of Praz sur Arly was originally made up of three hamlets, called "dîmeries": La Thona, Réon and the Pratz de Megève.The most populated was La Thona where the inhabitants quite logically built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.

Situated in the Commune of Flumet, on the border with Praz, on the road connecting the Christomet and the Tête du Torraz. It is a large brick building, 2 metres long and 3 metres high.The 4-sided roof is covered with sheet-metal and there is a wrought iron cross on the top. The building resembles a sentry-box. The walls surround a recess, and there is a holy water basin on the right hand side. A wrought iron gate protects the recess which contains a magnificent wooden Virgin and child. Water from a spring flows at the foot of the recess. The Virgin has been restored.

The mountain refuge of " Le Plan de l'Aar " is a hiking destination offering a very wide panorama at the finish. The hut is run by alpagists who serves meals and picnics to take away. The children find there all the animals of the farm.