国道219线新藏公路(西藏镜)区界山至日土段改建整治工程路线起点位于新疆、西藏两自治区交界处(桩号K649+200,海拔高度5040.8m),止于日土县北(终点桩号K926+480.135,海拔高度4200m),路线全长277.089km。项目区海拔在4200~5400m之间,海拔5000m以上地段长100km,红土达板垭口(桩号K739+320)为全线海拔最高处(5381.19m),起点至K733+450段属于连续片状多年冻土区,K733+450至终点属于季节冻土区。 Line 219 National Highway Tibet Road (Tibetan mirror) District boundary to the Japanese soil section Reconstruction Project The starting point is located at the junction of two autonomous regions in Xinjiang, Tibet (station number K649 +200, altitude 5040.8m), ending in the north of Ritto County (Tibet) End Stake K926 + 480.135, altitude 4200m), the route length of 277.089km. The elevation of the project area is between 4200 and 5400m, and the elevation above 5000m is 100km. The latticed plateau pass (station K739 + 320) is the highest point (5381.19m) of the whole line, and the starting point to K733 + 450 belongs to the continuous sheet-shaped Soil, K733 + 450 to the end of the season are frozen soil area.