Some of the world heritage sites in Vietnam include:

1. Tràng An
2. Huế Monuments Complex
3. Hội An Ancient Town
4. Mỹ Sơn Sanctuary
5. Hạ Long Bay
6. Phong Nha – Kẻ Bàng National Park

To preserve and promote these heritage sites, several measures can be taken:

1. Conservation Efforts: Implement strict conservation measures to protect the natural and cultural heritage of these sites, including monitoring visitor numbers, controlling development in the surrounding areas, and preserving the ecological balance.
2. Public Awareness: Raise awareness among local communities and visitors about the significance of these heritage sites. Education and outreach programs can help instill a sense of pride and responsibility in preserving these sites for future generations.
3. Sustainable Tourism: Develop sustainable tourism practices that minimize the impact on the environment and cultural heritage while providing economic benefits to local communities. This can include promoting responsible travel, eco-friendly accommodations, and supporting local artisans and businesses.
4. Legal Protection: Enact and enforce laws and regulations to safeguard these heritage sites from encroachment, illegal activities, and vandalism. This may involve designating buffer zones, establishing protected areas, and implementing heritage conservation plans.
5. International Collaboration: Engage in partnerships and collaborations with international organizations, experts, and other countries to exchange knowledge, best practices, and resources for the preservation and promotion of these heritage sites.