The Hua I Thu Map of China and the Barbarian Countries, one of the two most important monuments of mediaeval Chinese cartography, carved in stone in +1137 but probably dating from about +1040(from Chavannes)The size of the original (which bears the full explanatory text) which is now in the Pei Lin Museum at Sian, is about 3 ft square. The name of the geographer is not known.