About Ninh Binh:
Dubbed Ha Long Bay on rice paddies, this place doesn't have nearly as much climbing as Ha Long Bay, but the cliffs are similar in quality and form. Ninh Binh is located about 3 hours South of Hanoi.
There is also other sports climbing in the Ninh Binh area with 3- 4 routes on one cliff. The website www.vietclimb.com gives full details.