The Himalayas is the highest mountain range in the world, and has 9 out of 10 of the world's highest peaks, including Mount Everest. These mountains, referred to as the Third Pole, are the source of some of Asia's major rivers and also help to regulate our planet's climate. The Himalayas are the third largest deposit of ice and snow in the world, after Antarctica and the Arctic. There are approximately 15,000 glaciers located throughout the range. At 48 miles (72 km) in length, the Himalayan Siachen glacier is the largest glacier outside the poles. The Great Himalayas or Greater Himalayas or Himadri is the highest mountain range of the Himalayan Range. The world's highest peak, Mount Everest, as well as other “near−highest” peaks, such as Kangchenjunga, Lhotse, and Nanga Parbat, is part of the Greater Himalayas range. The Himalayas also act as a barrier to the monsoon winds coming from seas. Hence, they are an important cause of rainfall in India. They help in maintaining both the elements of climate, i.e. temperature and rainfall. The Himalayas have a significant impact on India's climate. Only the presence of the Himalayas makes India a monsoon land. It traps the monsoon winds from the Arabian Sea and the Bay of Bengal, forcing them to shed their moisture content within the Indian subcontinent in the form of snow and rain. A significant threat posed by climate change in the Himalayas is the continual formation of a large number of glacial lakes. The lakes consist of vast quantities of glacial melt water held in place by natural dams of stone and rubble.