It is impossible to give an exact figure regarding the number of mountains in the world. There are hundreds of mountains on land and under the sea. There are very few mountain ranges that are very tall and that have a permanent snow cover. The Alps in Europe, the Himalayas in Asia, the Andes in South America and the Rockies and Appalachian mountains in North America are well-known mountain ranges.
There are other lesser-known mountain ranges, such as the Pyrenees on the borders of France and Spain, the Atlas Mountains in Morocco, the Urals in Central Asia, the Sierra Nevada in Western United States, the Karakorum in India and Pakistan, the Hindu Kush Mountains in India and the Cascades on the border between Canada and the USA.
Australia has the famous Blue Mountains in New South Wales. New Zealand has the great Southern Alps. Mt. McKinley, the highest point in North America, is in the great Alaskan Range. Mt. Blanc, located in the French Alps, is the highest point in Europe. Mt. Everest is the highest peak in the world, with a height of 8848 meters.
There are undersea mountain ridges as well. The Mid-Atlantic Ridge runs along the length of the Atlantic Ocean from north to south and is more than 40,000 kilometers long.