Contents: Chapters: 1 - The relics of Cai Beo on the Island of Cat Ba. 2 - Soil layers / plies, cultural layers and archaeological relics / sites. Kitchen relics. Buried grave and human remains. Animal remains. 3 - Ceramic & stone archaeological vestiges. 4 - Prehistoric cultures. Historic division. The cultures of Cai Beo and Ha Long. Prehistoric cultural periods in the Cat Ba Island. 5 - Prehistoric culture of Cai Beo in the broader context. Prehistoric culture of the Northeast coastal area. Other cultures that located on the same line with the Cai Beo culture. Vietnam prehistoric ocean culture. Vietnam prehistoric ocean - mountain interaction. Conclusion. References.