The 3.5-kilometer Ma Phuc Pass marks the end of the 85-kilometer cycling journey. It is on Highway 3 in the border region between Hoa An and Quang Hoa Districts.
This pass, 620 meters above sea level, is embraced by two limestone formations that bear a striking resemblance to reclining horses.
This likeness led to the pass being named "Ma Phuc Pass" in which "Ma" means horse and "Phuc" means lying down.
Users need to navigate seven bends to reach the top. The Coc Phat junction is where the pass ends, and Provincial Road 205 to the Tra Linh border gate in Trung Khanh District, a trade hub connecting Vietnam and China, begins.
Dan Chuong, 46, found Cao Bang alluring. She described the cycling expedition as a miraculous experience, one that pushed her to her limits.
She eagerly awaits a return to Cao Bang to explore other gems like Pac Bo village, Dung Mountain, and Phong Nam Valley.