Reindeer are commonly found in the Arctic regions of the world, including Alaska, Canada, Greenland, and Russia. They are also found in some mountainous areas in Europe, such as the Alps. Reindeer are often seen in herds and can be spotted during winter when they migrate to lower elevations in search of food. You may be able to observe reindeer in their natural habitat by visiting these regions, but please be sure to observe them from a distance and do not disturb them.