See Russian article: Демаркация российско-китайской границы (2005); Chinese article: 中华人民共和国和俄罗斯联邦关于中俄国界东段的补充协定. September 2008 – 2009, the border between China and Tajikistan was surveyed. It's said that China "regained more than 1,000 km2".[5] 31 December 2008, the borderline between China and Vietnam was determined, but detailed information hasn't yet been published.[6] 2009, the artificial land (mainland China only) built by the nation would be 150 km2.[7]