The Cache
You are looking for an informational sign about the waterfall, written in both English and Vietnamese, at Ground Zero. FTF sent me this photo, I do believe that's the sign I've circled:
Location Information
Bản Giốc Falls sits on the border of China and Vietnam. It is an impressive and beautiful waterfall that is the fourth largest waterfall in the world at an international border, after Iguazu Falls between Brazil and Argentina, Victoria Falls between Zamibia and Zimbabwe, and Niagara Falls between the US and Canada. Thick forest covers both up and downstream, which, coupled with clean and frothy water all the year round and peaceful and lively human activities, will surely provide visitors with unforgettable experience. This site is jointly managed and operated by both Vietnam and China under the common Agreement that regulates touristic activities in Bản Giốc and the De Tian area, which was signed by the Governments of Vietnam and China.
Geology
Bản Giốc Falls is composed of a main and a subordinate waterfall, approximately 300m wide in total. The main waterfall, approximately 50m wide and 35m high, is on the border between China and Vietnam. The subordinate waterfall is situated in Vietnam and is 150m wide, including one cascade approximately 30m high.
At this locality, a NE-SW fault cuts through the thinly-bedded limestone and shale of the Ban Cong Formation (c.388-383 million years in age, containing Stromatoporoid Amphipora fossils).
Upstream the waterfall is a mature to old karst landscape with peak clusters-depressions merging with isolated towers on a planation surface at an altitude of 400-600m asl. Downstream the waterfall, the Quay Son River valley extends several km more in a NW-SE direction with fault cliffs and karst fields.
Further Information
The following are types of waterfalls:
Block: The water descends from a relatively wide stream or river.
Cascade: The water descends a series of rock steps.
Cataract: A large waterfall.
Fan: The water spreads horizontally as it descends while remaining in contact with bedrock.
Horsetail: The descending water maintains some contact with bedrock.
Plunge: The water descends vertically, losing contact with the bedrock surface.
Punchbowl: The water descends in a constricted form, then spreads out in a wider pool.
Segmented: Distinctly separate flows of water develop as it descends.
Tiered: The water drops in a series of distinct steps or falls.
Multi-step: A series of waterfalls one after another of roughly the same size, each with it's own sunken plunge pool.
Questions to Log the Cache
Please message or email me the answers to the following:
1) According to the sign at Ground Zero, what has resulted in uplift of the NW side and subsidence of the SE side, thus creating the waterfall?
2) Again according to the sign, how many steps or cascades does the main falls have?
3) What type of falls does this indicate Bản Giốc Falls is?
4) Do you think the subordinate fall is the same type of falls? Why or why not?
5) In your log, post a photo of you at the falls.