The Great Wall of China is a series of fortifications that were built across the historical northern borders of China to protect and consolidate territories of Chinese states and empires against various nomadic groups of the steppe and their polities.
Several walls were being built as early as the 7th century BC; these, later joined together and made bigger and stronger, are now collectively referred to as the Great Wall.
- - -The Amazon Rainforest, also known as Amazonia, is a vast tropical rainforest in South America that covers much of the Amazon Basin. It is known for its biodiversity and is home to millions of species of plants, animals, and insects.
-The Amazon Rainforest plays a crucial role in regulating the Earth's climate and is often referred to as the "lungs of the Earth" because it produces a significant amount of the world's oxygen.