The Hindu Kush is not technically a part of the Himalayas, although it is often associated with the Himalayan mountain range due to its proximity and similar geological features. The Hindu Kush is a separate mountain range located in Central Asia, stretching between central Afghanistan and northern Pakistan.
The Himalayas, on the other hand, are situated to the east of the Hindu Kush and extend across five countries: India, Nepal, Bhutan, China, and Pakistan. While both mountain ranges are part of the larger Alpide belt, they are distinct in terms of their geological formation and geographical location.
In summary, the Hindu Kush and the Himalayas are separate mountain ranges, but they are often mentioned together because of their close geographical relationship and shared characteristics.