Mountains mean rivers, rivers mean agriculture, and agriculture means more people. The Himalayas are the largest mountains in the world, and the countries flank

Mountains mean rivers, rivers mean agriculture, and agriculture means more people. The Himalayas are the largest mountains in the world, and the countries flanking them have always been the most populous. Try an image search for "rivers of Asia" and you'll see a bunch of lines pointing near the center of that circle.