Lake Annecy is gorgeous …. period. It is over nine miles long, making it France’s third largest lake. It is also the country’s cleanest. The section seen from the Promenade Jacquet is called the Grand Lac. It was created by a melting glacier thousands of years ago which is why it reaches a maximum depth of almost 270 feet. It is fed from several rivers flowing down the surrounding mountains named Dents de Lanfon, Lanfonnet and La Tournette.