The Ancient Khmer Highway was a significant trade route in the Khmer Empire, connecting important cities like Angkor and Phnom Penh. This highway facilitated the movement of goods, people, and ideas, contributing to the empire's economic and cultural development during its peak from the 9th to the 15th centuries. Constructed with advanced engineering techniques, the highway featured stone pathways and bridges, allowing for efficient travel across diverse landscapes. It played a crucial role in the spread of Hinduism and Buddhism, as well as the exchange of resources such as rice, silk, and spices, which were vital to the empire's prosperity.