An arid region is a type of climate characterized by very low rainfall, typically less than 250 millimeters (10 inches) per year. These areas often experience high temperatures during the day and cooler temperatures at night. The lack of moisture leads to limited vegetation, with plants adapted to dry conditions, such as cacti and succulents. Common examples of arid regions include deserts like the Sahara Desert in Africa and the Mojave Desert in North America. These environments can be challenging for wildlife and human habitation, but some species and communities have developed unique adaptations to survive in such harsh conditions.