Quetta is the largest city and the provincial capital of the Balochistan Province of Pakistan. Known as the "Fruit Garden of Pakistan" due to the diversity of its plant and animal wildlife, Quetta is home to the Hazarganji Chiltan National Park, which contains some of the rarest species of wildlife in the World. The city is situated at an average elevation of 1,654 metres (5,429 ft) above sea level, making it Pakistan's only high-altitude major city. The city is in a seismically active area , and was levelled by the 1935 Balochistan earthquake. The city is home to the Geological Survey of Pakistan on account of the city's seismic activity.Hanna Lake, which nestles in the hills ten kilometres (six miles) east of the city, is a startling turquoise pool which contrasts markedly with its bare brown surroundings.The Hazarganji Chiltan National Park, 20 km (12 mi) south-west of Quetta, Markhors is a protected park area.The Quetta Geological Museum, located on Sariab Road has a collection of rocks and fossils found in Balochistan.