The Himalayas were the highest mountain range on planet Earth, located on the continent of Asia. Both Mount Everest (the highest point above sea level on Earth) as well as the Tibetan plateau were located here.
A photograph of Henry Starling standing on a plateau in front of Nuptse, a mountain in the Himalayas, was displayed in his office at the Chronowerx Industries building. (VOY: "Future's End")
In 2367, a holodeck program existed that recreated an ancient trail along the Kabul River in the Himalayas for use during virtual horseback riding. (TNG: "The Loss")
In a holonovel owned by Julian Bashir, Doctor Hippocrates Noah had a secret base on Mount Everest in the Himalayas, which would be the only place left above water when he fired lasers into the Earth's core to release magma and settle the Earth's tectonic plates. (DS9: "Our Man Bashir")