China has a long and complex history, and the Great Wall of China was built as a gigantic defensive structure to protect against attacks from northern barbarians. China is located in Southeast Asia along the Pacific coast, bordering 10 countries, and has an area of over 9.6 million square kilometers, making it the world's third largest country. The Great Wall of China, built from various materials like stone and brick, remains one of China's most famous tourist attractions and was constructed to safeguard its northern border.