Geneva 15.7%. Of the agricultural land, 0.3% is used for growing crops. Of the water in the municipality, 0.2% is composed of lakes and 2.9% is rivers and streams. The altitude of Geneva is , 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. This rock was chosen by General Guillaume Henri Dufour as the reference point for surveying in Switzerland. The second main river of Geneva is the Arve, which flows into the Rhône just west of the city centre. Mont Blanc
Geneva 10,486 upper-secondary students from the municipality along with 10,330 students who were in a professional, non-university track program. An additional 11,797 students were attending private schools. Geneva is home to the University of Geneva. In 1559 John Calvin founded the Geneva Academy, a theological and humanist seminary. In the 19th century the Academy lost its ecclesiastic links and in 1873, with the addition of a medical faculty, it became the University of Geneva. In 2011 it was ranked European university. The Graduate Institute of International and Development Studies was among the first academic institutions in the World to teach international