Lang Son Province
On the border of Vietnam with China, Lang Son Province is primarily agricultural, but, as a transportation route between the countries, is gaining commercial importance. Its Huu Nghi (Friendship Gate) is the northern termination of National Highway 1. It is 154 north of Hanoi.
A land mine problem, resulting from Sino-Vietnamese conflict, has been reduced, but remains a hazard in some areas.
Planned economic development will create a Dong Dang border-gate economic zone, part of a Lang Son Province-Hanoi-Haiphong-Quang Ninh Province corridor from China, through Vietnam to the Bac Bo (Gulf of Tonkin) and other ASEAN nations.  Funding for border development is coming from the Asian Development Bank, as part of wider financing of Vietnamese developent.
- "Lang Son to develop economic zone", Vietnamese Business Finance, Jan 24, 2009
- [http://www.adb.org/Documents/RRPs/VIE/41414-VIE-RRP.pdf Proposed Technical Assistance Loan and Technical Assistance Grants, Socialist Republic of Viet Nam: Greater Mekong Subregion Ha Noi–Lang Son, Greater Mekong Subregion Ha Long–Mong Cai, and Ben Luc–Long Thanh Expressways Technical Assistance Project], October 2008, Project Number: 41414