The Phia Mun cave in Tuyen Quang Province has yielded artefacts dating as far back as 7,000 years. The excavation, which started last year, has just completed its second phase.
Phia Mun Cave reveals wealth of archaeological treasures [Link no longer active]
Viet Nam News, 13 November 2008
Archaeologists have finished the second phase of excavation at Phia Mun Cave, Na Hang District in the province of Tuyen Quang and have uncovered over 1,000 relics and 12 tombs of the Neolithic Hoa Binh culture
Excavations began in May last year and archaeologists soon realised the importance of the site, as they quickly uncovered objects 6,000 to 7,000 years old, and concluded that the cave was inhabited during Neolithic times.