The Hindu Kush is a massive mountain range, a geographical feature that forms the western section of the larger Hindu Kush Himalayan (HKH) Region. Stretching approximately 800 kilometers (500 miles), it runs through central and eastern Afghanistan into northwestern Pakistan and far southeastern Tajikistan. The range is a crucial drainage divide, separating the Amu Darya (ancient Oxus River) valley to the north from the Indus River valley to the south. Its highest peak is Tirich Mir at 7,708 meters (25,289 ft) in Pakistan.
Historically, the name Hindu Kush is relatively recent, first appearing in the writings of Ibn Battuta in the 14th century. The popular, though debated, etymology translates it as "Hindu-killer" or "Hindu-slayer," which Ibn Battuta attributed to the death of slaves from the Indian subcontinent who perished in the harsh climate while being transported to Turkestan. The high-altitude passes, or "kotals," of the Hindu Kush have historically served as a vital, yet difficult, passageway for trade, culture, and invasions into the Indian subcontinent, including the route taken by Alexander the Great. The region was also a significant center for Buddhism, home to sites like the Bamiyan Buddhas.
The Hindu Kush is a critical component of the "Water Tower of Asia," as its meltwater feeds major river systems, including the Indus, Ganga, and Brahmaputra. In recent years, the Hindu Kush has been significantly impacted by climate change, with the HKH region experiencing a warming rate of 0.2 °C per decade over the past 50 years. Reports from the International Centre for Integrated Mountain Development (ICIMOD) highlight that the seasonal snow persistence in the HKH has reached its lowest level in 23 years, threatening the water security of nearly two billion people downstream. This decline in snow persistence, which was 23.6% below normal in the 2025 update, is a major recent change that poses a serious risk of water shortages in river basins like the Indus.