Mountain Passes, Altitude, and Human Settlement

Mountain passes have long served as the connective tissue of highland regions, the low points through otherwise formidable ranges where trade, migration, and armies could cross. The Khyber Pass, at roughly 1,070 meters between Afghanistan and Pakistan, has functioned for millennia as a strategic corridor linking Central and South Asia, carrying traders, conquerors, and pilgrims along routes tied to the broader Silk Road network. In the high Himalaya and Karakoram, passes such as Khardung La in India's Ladakh region, at about 5,359 meters, are frequently promoted as among the highest motorable roads on Earth, even where rival claims and exact elevations remain disputed among competing tourist and government sources.