Babu is located on the Thorne River on the northern outskirts of Lyon. The island is lush and beautiful. Roman times called Barbara, and the Latin barbara was originally meant as the Roman nickname for the Gaul barbarians, the source of the word barbarian in modern English. From the source, it can be seen that Lyon was already on the edge of the Roman "civilized world". There is a Roman-era Notre Dame cathedral on the island. Under the Cuire station of Metro Line C.