The park is located in the Graian Alps in the regions of Piedmont (in the Metropolitan City of Turin) and Aosta Valley in north-west Italy. It encompasses 703 square kilometres (173,715 acres) of alpine terrain. 10% of the park's surface area is wooded. 16.5% is used for agriculture and pasture, 24% is uncultivated, and 40% is classified as sterile. 9.5% of the park's surface area is occupied by 57 glaciers. The park's mountains and valleys were sculpted by glaciers and streams. Altitudes in the park range from 800-4,061 metres (2,624-13,323 ft), with an average altitude of 2,000 metres (6,561 ft). Valley floors in the park are forested. There are alpine meadows at higher altitudes. There are rocks and glaciers at altitudes higher than the meadows. Gran Paradiso is the only mountain entirely within the boundaries of Italy that is over 4,000 metres (13,123 ft) high. Mont Blanc and the Matterhorn can be seen from its summit. In 1860, John Cowell became the first person to reach the summit. To the west, the park shares a boundary with France's Vanoise National Park. They co-operate in managing the ibex population, which moves across their shared boundary seasonally.