French campsite security deposit

I recently booked a campsite in the south of France and paid € 50 for the reservation. The campsite now tells me that I have to pay an additional deposit of € 100 and the remaining € 30 for the reservation on arrival. Is this normal in France? I have never asked for a deposit at a campsite before. The deposit request is genuine.

Is there a campsite in Sharm el-Sheikh, Egypt?

I have my own tent. Is there a campsite (or hotel) where I can camp? I am looking for a campsite within a radius of 10 km from the city center.