Hello,
Lantosque is the name of a very beautiful town located high in the Vésubie Valley 20 km north of Nice, adjacent to a national park (Parc national du Mercantour). The town has 1,260 residents, and it famous for a chestnut festival in the mountain foothills each autumn.
Your cemetery is located in this town.
Here is an article about Lantosque at Wikipédia (français) :
http://fr.wikipedia.org/wiki/Lantosque(There is also an article at English Wikipedia, but it does not have any information.)
Please search for Lantosque at Google Images to see photos of this really lovely place.
I hope you can visit some day !