Official and public-sector sources
VietnamWaving brings together information about places, heritage, culture, nature, infrastructure, travel and other aspects of Vietnam. No single source can accurately cover all of these subjects, so we use different types of sources depending on the information being researched.
For administrative, regulatory, infrastructure and other official information, we generally give preference to relevant public authorities and official publications when suitable information is available. These may include national government bodies, ministries, provincial or municipal authorities, public agencies and official tourism organizations.
Official sources can be particularly important for administrative status and boundaries, officially recognized heritage, public infrastructure, transport projects, protected areas, government statistics, regulations and public announcements.
International organizations
For internationally recognized designations or internationally comparable information, VietnamWaving may use relevant international organizations. UNESCO, for example, is particularly important when describing UNESCO World Heritage properties and other UNESCO designations.
Other international institutions may be appropriate for statistics, development indicators, conservation information or specialist subjects within their areas of responsibility. Where a designation belongs to a specific organization, we aim to describe it accurately rather than treating different recognition systems as interchangeable.
Cultural, heritage and specialist institutions
Museums, heritage institutions, universities, research organizations and specialist bodies can provide valuable context that is not always available from general sources. Such sources may support research into history, archaeology, architecture, cultural traditions, biodiversity, conservation, local crafts and scientific subjects.
Where interpretations differ, VietnamWaving aims to avoid presenting a disputed interpretation as undisputed fact.
Operators and first-party sources
For airports, transport services, museums, attractions, educational institutions and other operating organizations, first-party information can be useful for practical facts about their own facilities and services.
First-party sources are treated differently from independent evidence. An organization's promotional description, for example, is not automatically adopted as an independent assessment of its quality or importance.
Statistics and quantitative information
Statistics require particular care because figures can refer to different years, definitions, geographic boundaries and methodologies. Where practical, VietnamWaving seeks to identify the relevant period and context rather than combining figures that are not directly comparable.
Statistics may be revised after publication. Administrative changes can also make older geographic statistics difficult to compare directly with newer ones. When timing materially affects interpretation, readers should consult the underlying official or specialist source before making important decisions.
Maps and geographic information
Geographic information may be assembled from multiple appropriate sources depending on the subject. Coordinates are intended primarily to support discovery and orientation. They should not automatically be interpreted as legal boundaries, cadastral information, navigation instructions or survey-grade geographic data.
Not every place documented by VietnamWaving appears on a map. Some map views are curated around particular themes and inclusion criteria.
Infrastructure and future projects
Infrastructure information requires a clear distinction between what exists today and what may exist in the future. Where relevant, VietnamWaving aims to distinguish between infrastructure that is operating, under construction, planned or approved, and proposed or otherwise at an earlier stage of development.
A planned airport, railway, road or development should not be described as though it were already operating. Projects can be delayed, redesigned, relocated or cancelled, so current project status should be verified before relying on it for a significant decision.
Secondary sources
Credible secondary sources can provide useful reporting, explanation and context, particularly where primary documents are difficult to interpret or where a subject benefits from independent reporting.
We consider factors such as relevance, specificity, recency, editorial standards and whether the source can reasonably support the particular information being used. A widely repeated claim is not necessarily reliable merely because many websites repeat it.
Conflicting information
Sources sometimes disagree because of publication dates, administrative changes, different definitions, revised statistics, translation, reporting errors or genuine uncertainty.
When a meaningful conflict can be identified, VietnamWaving may prefer a more authoritative or more recent source, qualify the statement, present information as an estimate, distinguish different definitions, or omit a claim that cannot be supported with sufficient confidence.
We do not assume that averaging conflicting figures produces a more accurate answer.
Source freshness and displayed sources
Different information changes at different speeds. Historical facts may remain stable for decades, while transport operations, development projects, administrative information and visitor conditions can change much more quickly. We therefore consider freshness in relation to the subject rather than applying one universal expiration period.
Where appropriate, individual guides may identify important sources used for their information. A displayed source list should not necessarily be interpreted as a complete research bibliography. It is intended to help readers understand where important facts originate and, where necessary, continue their own research.
For more on how sources are evaluated and information is organized, see our Methodology.
Corrections
Even carefully sourced information can become outdated or contain errors. If you identify a factual issue, an outdated detail or a source that materially changes the interpretation of a VietnamWaving page, please contact us with enough information to investigate it.
Useful correction reports include the page concerned, the specific statement in question and, where possible, a reliable supporting source.