1.5–1.6 m, this means the Dutch ship would be 45–48 m long and the cannon would be 3–3.2 m long. Taking 1.6 m for 1 zhang, Zheng He's 44 zhang treasure ship would be long and wide, or 22 zhang long and 9 zhang wide if the zhang is taken to be 3.2 m. It is known that the measure unit during the Ming era was not unified: A measurement of East and West Pagoda in Quanzhou resulted in a zhang unit of 2.5–2.56 m. According to Chen Cunren, one zhang in the Ming Dynasty is only half a zhang in modern times. Treasure Shipyard excavation From 2003 to 2004, the Treasure Shipyard was excavated in northwestern Nanjing (the former capital of the Ming Dynasty), near the Yangtze River. Despite the site being referred to as the "Longjiang Treasure Shipyard" (龍江寶船廠) in the official names, the site is distinct from the actual Longjiang Shipyard, which was located on a different site and produced different types of ships. The Treasure Shipyard, where Zheng He's fleet were believed to have been built in the Ming Dynasty, once consisted of thirteen basins (based on a 1944 map), most of which have now been covered by the construction of buildings in the 20th century. The basins are believed to have been connected to the Yangtze via a series of gates. Three long basins survive, each with wooden structures inside them that were interpreted to be frames for the ships to be built on. The largest basin extends for a length of . While they were long enough to accommodate the largest claimed Zheng He treasure ship, they were not wide enough to fit even a ship half the claimed size. The basin was only wide at most, with only a width area of it showing evidence of structures. They were also not deep enough, being only deep. Other remains of ships in the site indicate that the ships were only slightly larger than the frames that supported them. Moreover, the basin structures were grouped into clusters with large gaps between them, if each cluster was interpreted as a ship framework, then the largest ship would not exceed at most, probably less. The 2003–2004 excavation also recovered two complete wooden rudderposts from the Treasure Shipyard, in addition to another recovered in 1957. They are made of teak and measured around in length. Zhou Shide (1962)