To the nearest 1,000 miles, how long is the Great Wall of China?

The Great Wall of China is approximately 13,170 miles long when considering all of its branches and sections. Rounding this figure to the nearest 1,000 miles results in 13,000 miles, making it the most accurate choice based on the provided options. This figure takes into account various segments of the wall constructed over different dynasties, including walls, trenches, and natural barriers that were utilized in its overall structure. Understanding the extensive history and construction of the wall provides context for its impressive length and highlights why the rounded figure aligns with the information available about its total length.