The 57-year-old British man died on Wednesday afternoon in a lake at the campsite in Marandan, in the Isere region of south east France.
The man, who is believed to have lived nearby in Saint Jean en Royons, was reportedly swimming in the lake near the campsite at Marandan.
The lake has a supervised area for bathing, Yannick Meheust from the Campsite at Lac du Marandan told The Local that the victim, named only as Roger, was swimming outside the supervised area.
The exact cause of the drowning remain unknown but Meheust said it is believed the victim may have suffered from a heart attack while diving under water.
"The victim's wife alerted life guards when she could no longer see him swimming," Meheust told The Local.
"We alerted the rescuers and they tried to search for the body. In the end we had to call the fire fighters who spent two and half hourse searching, before they recovered his body.
The drowning comes days after a British rugby player on holiday in France drowned after reportedly being hit by a giant wave.
On Thursday new stats were revealed that showed the number of drownings this summer had rised significantly on last year, particularly among young people and the over 65s.
This summer there has been 761 cases where people have got into trouble in lakes, rivers, pools and the sea, resulting in 261 deaths.