“The Palaearctic and Oriental regions are divided by:”

"The Himalayas separate the Palaearctic and Oriental biogeographic regions defining distinct ecosystems. The Palaearctic region covers temperate zones while the Oriental region includes tropical South Asia. The Himalayas’ towering ranges create a natural barrier influencing biodiversity and climate patterns. This division is critical for studying ecological and species distribution. Understanding the Himalayas’ role highlights their significance in shaping global biogeography and supporting unique flora and fauna in diverse environmental zones."