The region that lies on both sides of the equator is called the Equatorial region.

Explanation:
The equator is an imaginary line that divides the Earth into the Northern Hemisphere and the Southern Hemisphere. The region that lies on both sides of this line is known as the Equatorial region. This region is located near the center of the Earth and experiences unique climatic conditions and biodiversity.

Key Points:
1. The equatorial region spans approximately 6,000 miles and covers parts of three continents: Africa, Asia, and South America.
2. The equatorial region is characterized by high temperatures and humidity throughout the year.
3. The equatorial region receives abundant rainfall, often in the form of heavy thunderstorms and intense tropical rainforests.
4. The Amazon Rainforest in South America, the Congo Rainforest in Africa, and the Indonesian Rainforest in Asia are some of the world's largest equatorial rainforests.
5. Due to the consistent warm temperatures, the equatorial region supports a wide variety of plant and animal species, including unique and diverse ecosystems.
6. The equatorial region is home to iconic animals such as the orangutan, gorilla, jaguar, and many species of tropical birds.
7. The equatorial region is also known for its rich cultural heritage, as it is inhabited by numerous indigenous tribes and communities.
8. The equatorial region plays a crucial role in regulating global climate patterns and maintaining biodiversity.

In conclusion, the region that lies on both sides of the equator is known as the Equatorial region. It is characterized by high temperatures, abundant rainfall, and rich biodiversity. This region is of great importance both ecologically and culturally.