Ban Zu is believed by some scholars to be located on today's Fort Canning Hill and its nearby areas. Ruins of an old city in Singapore were still visible by the early 19th century, but have since been obliterated by the development of Singapore. Stamford Raffles mentioned the lines of the old city and its defences, and the British Resident John Crawfurd wrote about the ruins in some details. Crawfurd described in 1822 the ancient city as being roughly triangular in shape with a base of around a mile in length. It was bounded to the north by remnants of a wall nearly a mile long, around wide and about 8- high along present day Stamford Road, the east by the sea, and the west by a salt creek that would overflow at high water. A fresh water rivulet formed a kind of a moat alongside the wall. Although Wang Dayuan mentioned that Ban Zu was gated, no opening was apparent along this wall according to Crawfurd. Crawfurd also noted the remains of buildings, some of brick foundation, on the west and northern side of Fort Canning Hill. Among these are ruins of a terrace square near the top of the hill that he took to be a temple, with another terrace almost as big on the northern slope of the hill that local Malays believed to be the tomb of Iskandar Shah (who actually died in Malacca). Crawfurd also mentioned ancient fruit trees cultivated in the gardens, and found pottery fragments and Chinese coins, the earliest of which dating to 10th century Song Dynasty.