The Hoang Long stream meanders between a field of land with a width of about 10km, limited by two limestone massifs: Hoa Lu near Tam Coc Ninh Binh and Van Long (on the left), which is supplied with water from the mountains and forests of Cuc Phuong National Park. across the Lang River, from the Boi River flowing from Hoa Binh, from the Hoa Lu mountains through the Sao Khe stream.
In the context of tens of thousands of years ago when the sea level was tens of meters lower than the present sea level, the Hoang Long stream near Tam Coc Ninh Binh followed the Day river, flowing hundreds of kilometers long, reaching towards the East Sea. When the sea level rises, the water level is about 4 meters higher than the current sea level, corresponding to the advance of the sea about 4,000 to 7,000 years ago, then the Hoang Long stream is hidden in the bay. This sea bay is limited by limestone mountain ranges from Gia Vien to Nho Quan, through Tam Diep and Hoa Lu mountains – Trang An Heritage near Tam Coc Ninh Binh is like an archipelago in that ancient bay.
This mountainous area…
This mountainous area along the ancient bay has revealed many prehistoric archaeological relics belonging to Hoa Binh and Da But cultures. On the ancient alluvial steps and riverbanks, there are vestiges of the Dong Son culture or Northern colonial architectures such as: The system of vaulted tombs was discovered in the communes of Quynh Luu, Gia Thuy, Gia Tuong (Ngo Quan), Lien Son commune (Gia Vien) and a series of relics related to the space of the Haitian uprising. Mrs. Trung early AD; The uprising of Phung Hung – Bo Cai Dai Vuong in the 8th century marked a long mile of national history.
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