The "hanging valley" of Soc Giang is located near the Soc Giang International Border Gate in Ha Quang District.
The lower part of the observation site is a large active valley that is currently used for rice cultivation. Being slightly inclined towards the southeast, it is formed along the northwest-southeast Cao Bang-Tien Yen fault. The fault itself is considered active, which is indicated by many signs, such as the slipping between rock massifs and uplift of the terrain.
An evidence of uplift is a "hanging valley", which used to be a relatively flat ancient valley surface that was then uplifted and “hung” on the slope of the terrain. The morphology of the hanging valley and sediment accumulation from river and stream remain, although they are gradually eroded and smeared with time. Some cone-shaped limestone peaks that appear on the edge of the "hanging valley" are remnants of an ancient fault surface, known technically as a "tectonic facet" - a trace of tectonic activity that is only about 10,000 years old.
Added to the value of the site and the area around, besides the temple of Nung Tri Cao, a heroic general who in 1403 was awarded the title “Thai Bao”, there is also a 300 years old “Sau” tree (Dracontomelon duperreanum), which is recognized as a Vietnam’s Heritage Tree. They are perpetual historic witnesses of all the ups and downs of the Cao Bang Province in general and the Ha Quang District in particular.