Na Duong Valley

Na Duong Valley is a lowland basin centered on Na Duong Town in Loc Binh District, Lang Son Province, northeastern Vietnam, about 10 km southeast of Lang Son City. It is notable for the Na Duong coal mine and the internationally significant Na Duong fossil Lagerstätte, an Oligocene site dating to about 30 million years ago that has yielded well-preserved vertebrate, plant and invertebrate fossils. The valley is framed by low limestone karst hills, rice fields and coal-bearing sediments.

Visitors can expect a broad, flat agricultural valley surrounded by low limestone karst hills. The landscape is dominated by rice paddies, rural settlements and the open-pit Na Duong coal mine on the valley floor. The main point of interest is the Na Duong fossil site area, where Oligocene sedimentary layers are exposed. There are no developed tourist structures inside the valley itself; the experience is primarily scenic viewing, photography and observing the rural and mining landscape from public roads around Na Duong Town.

Na Duong Valley contains the Na Duong coal-bearing basin and the Na Duong biota, an Oligocene Lagerstätte dated to approximately 30 million years ago. Systematic paleontological research since the late 1990s has documented diverse fossils including fish, turtles, crocodilians, mammals and plants, providing important evidence for the paleoenvironment of northern Vietnam during the Paleogene. The coal deposits have been exploited by the Na Duong coal mine for several decades.

The valley is an agricultural area inhabited primarily by Tay and Nung ethnic communities, with rice cultivation as the main land use outside the mining area. The fossil site has cultural and educational significance as a nationally recognized paleontological heritage locality in Lang Son Province.