Regional variations refer to the differences in culture, language, climate, and lifestyle that can be found in different areas of the world. For example, the way people celebrate holidays can vary greatly from one region to another. In Italy, families might gather for a big feast during Christmas, while in Mexico, the celebration of Día de los Muertos involves honoring deceased loved ones with colorful altars. These variations can also be seen in the natural environment. For instance, the Amazon Rainforest in Brazil has a tropical climate and diverse wildlife, while the Sahara Desert in Africa is characterized by arid conditions and sand dunes. Understanding these regional differences helps us appreciate the rich tapestry of human experience and the planet's ecosystems.