14 mountains are over 8,000 meters high, among them the K2, Nanga Parbat and Mount Everest, at 8,848 meter the world’s highest mountain. The Himalayas extend over 1,500 miles (2,400 km) from the Indus Valley in the west to the Brahmaputra Valley in the east.They are between 100 and 250 kilometers wide.hey are a part of in Nepal, India, Pakistan, Tibet and Bhutan. The mountains are the highest in the world, reaching almost 9,000 meters above sea level. The Himalayas separate the Indian subcontinent from the inner part of Asia.