The altitude of Geneva is 373.6 metres ( 1,225.7 ft ) , and corresponds to the altitude of the largest of the Pierres du Niton , two large rocks emerging from the lake which date from the last ice age .
The altitude of Geneva is 373.6 m . That is the altitude of the largest of the Pierres du Niton , two large rocks in the lake , are used as the reference point for all surveying in Switzerland .