Australia is home to the world's longest fence, known as the Dingo Fence or Dog Fence. Stretching over 5,600 kilometers (3,480 miles), it was originally built in the 1880s to protect fertile land in the southeast from dingoes (wild dogs) and other pests. Today, it remains an engineering marvel and a testament to Australia's vast landscapes and unique wildlife. The fence runs through multiple states and territories, showcasing the country's commitment to preserving its agricultural resources and protecting native species.