The answer to the riddle "What is 9 metres high, 7 metres wide, and 2,500 kilometres long?" is the Great Wall of China. This ancient wonder of the world stretches across northern China, spanning over 2,500 kilometres in length. It is a massive structure that is 9 metres high and 7 metres wide at its base.

The Great Wall of China is not only a symbol of China's rich history and culture but also a marvel of engineering. It was built over centuries by various Chinese dynasties to protect the northern border of the country from invasions and attacks. The wall is made up of stone, brick, tamped earth, wood, and other materials, showcasing the ingenuity and craftsmanship of the ancient Chinese builders.

Today, the Great Wall of China is one of the most visited tourist attractions in the world, drawing millions of visitors each year. It offers breathtaking views of the surrounding landscapes and a glimpse into China's past. Visitors can walk along the wall, explore watchtowers, and learn about the history and significance of this iconic structure.

From a SEO perspective, the Great Wall of China is a highly searched keyword with a lot of potential for driving traffic to websites related to travel, history, and tourism. By including relevant keywords such as "Great Wall of China," "2,500 kilometres long," and "ancient wonder of the world" in your content, you can improve your website's visibility and attract more visitors.

In conclusion, the Great Wall of China is a monumental feat of human achievement that continues to awe and inspire people from around the world. Its impressive dimensions of 9 metres high, 7 metres wide, and 2,500 kilometres long make it a must-see destination for anyone interested in history, culture, and architecture. So, if you ever find yourself in China, don't miss the opportunity to walk along this incredible structure and experience its grandeur firsthand.

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