The Envoy Ship Journeys to China (皇華使程圖 – literally translated as Maps of the Itinerary of the Envoy’s Journey to China, or Hoàng hoa sứ trình đồ in Vietnamese), is a book that contains various pictures and abundant and valuable information on the itinerary of missions of Vietnamese ambassadors and envoys in the 18th century. It was compiled, edited and annotated by Nguyễn Huy Oánh (1713-1789) from 1765 to 1768, making use of the documents handed down by many previous generations of envoys, and to which he also added details from his own mission that took place in 1766 and 1767.
The inscription is the only restored handwritten and painted duplicate after the original book by Mr. Nguyen Huy Trien (1852-1909) written and painted in February 1887 in the village Truong Luu in Can Loc district, Ha Tinh province. The original was lost. This is a document of considerable significance, providing information pertaining to the Sino-Vietnamese diplomatic relationship and cultural communication as well as Vietnamese understanding on China in the latter half of the eighteenth century. The Vietnamese journeys have been verified by the First Historical Archives of China as having taken place, showing that the materials, particularly the detailed maps, are authentic and rare.