Ku soo dhawoow marinka hoose ka dibna ka jawaab su'aasha ka dib isla luqadda marinka: Marinka: Isgoyska qaybta waqooyi ee xadka Vietnam-China waa dusha sare (buuraha) waxay u jeestay galbeedka ilaa bari waa: Bắc Hà, Quản Bạ, Đồng Văn. Laba dusha sare ee ugu horeysa waxay leeyihiin celcelis ahaan 1000-1200m. Đồng Văn Plateau waa 1600m. Wabiga iyo durdurka dhex mara dusha sare waxay abuureen dooxooyin dhaadheer oo qoto dheer. Waxa kale oo jira qaar yar oo bannaan, kuwaas oo ah Thất Khê, Lạng Sơn, Lộc Bình, Cao Bằng. Su'aal: Waa maxay celceliska sare ee mitirka Quan Ba?
1000 ilaa 1200m