Why are the Himalayas and Hindu KUSH linked together?

The Himalayas and Hindu Kush mountain ranges are linked geographically and geologically as part of the larger Himalayan orogeny, formed through the collision of the Indian and Eurasian tectonic plates. Both ranges extend across northern India, Pakistan, and Afghanistan, showcasing similar geological characteristics and climatic influences. They also share cultural and historical connections, with significant impacts on the regions' ecosystems and human settlements. Together, they form a formidable barrier that influences weather patterns and biodiversity in South Asia.