1. The Himalayas: Located in Asia, this mountain range is home to the 14 highest peaks in the world, including Mount Everest, the highest mountain on Earth.

2. The Karakoram Range: Also located in Asia, this range is closely connected to the Himalayas and features some of the world's most rugged and formidable peaks, including K2, the second highest mountain in the world.

3. The Pamir Mountains: Often called the "Roof of the World", this mountain range lies in Central Asia and is characterized by its high altitude and rugged terrain.

4. The Hindu Kush: This mountain range, stretching across Afghanistan and Pakistan, is known for its steep slopes and numerous high peaks.

5. The Tian Shan: This mountain range in Central Asia features a variety of landscapes, from towering peaks to vast glaciers, making it a popular destination for hiking and mountaineering.

6. The Kunlun Mountains: These mountains in China are known for their length and diverse terrain, including high peaks, deep canyons, and extensive deserts.

These mountain systems are all part of the Himalayan-Tibetan orogenic belt, a complex system of mountains formed by the collision of the Indian and Eurasian tectonic plates.