Himalayas /ˌhɪm.əˈleɪ.əz/ noun[plural only]1 •The mountain range in south-central Asia, which extends about 2,414 km (1,500 mi) through Kashmir, northern India, southern Tibet, Nepal, Sikkim, Bhutan and Assam; it contains nine of the world’s ten highest peaks, including Mount Everest/Qomolongma.