North America:
* United States: Arizona, California, Nevada, Texas, New Mexico, Utah, Colorado, Oklahoma, Kansas, and the Southwest in general.
* Mexico: Many different species, including the iconic saguaro cactus.
South America:
* Argentina: The Andes Mountains and Patagonia have a variety of cacti.
* Chile: Atacama Desert, one of the driest places on Earth, is home to many cacti.
* Brazil: The Caatinga dry scrublands in the northeast are home to a diversity of cacti.
* Peru: The arid coastal region and the Andes Mountains have cacti.
Other Regions:
* Australia: The outback has a unique variety of cacti.
* Africa: The Sahara Desert and other arid regions have cacti.
* Madagascar: Has its own unique species of cacti.
* India: The Thar Desert in northwest India has cacti.
Important Note: It's illegal to collect cacti from the wild in many countries, as they are often endangered or threatened species.
If you're interested in cacti, you can find them at nurseries, botanical gardens, or online retailers.