The longest canal in the world is the Grand Canal in China. Stretching approximately 1,776 kilometers (1,104 miles), it was built to facilitate the transportation of goods and materials. Originating in the northern city of Beijing and flowing south to Hangzhou, the Grand Canal has a history that dates back over 2,500 years. It played a crucial role in boosting trade and cultural exchange between different regions of China. Today, the canal remains vital for the economy and is recognized as a UNESCO World Heritage Site, celebrated for its historical significance and engineering marvel.