(i) The Himalayas, geologically young and structurally fold mountains, stretch over the northern borders of India.
(ii) These mountain ranges run in a west-east direction from the Indus to the Brahmaputra.
(iii) The Himalayas represent the loftiest and one of the most rugged mountain barriers of the world.
(iv) They form an arc which covers a distance of about 2,400 km. Their width varies from 400 km in Kashmir to 150 km in Arunachal Pradesh.