NUTS statistical regions of Bulgaria

Edition-qualified unit

Record the official code, level and classification edition together, retaining the source entry used to establish identity.

1. Which official Bulgarian NUTS entry establishes this unit's code and level in the selected edition? provenance
2. Does the supplied identifier represent a territorial region, the country reference or a special statistical allocation? definition

Name disambiguation

Retain authoritative names separately from search aliases, and require explicit territorial identification when a label such as Sofia could be ambiguous.

1. What Bulgarian Cyrillic name and Latin rendering does the edition's official list provide? provenance
2. Could this label refer to a settlement, an administrative territory or a different statistical unit? boundary

Published hierarchy

Treat regional counts and composition as edition-specific. NSI describes Bulgaria's NUTS 2027 structure as one NUTS 1 region, four NUTS 2 regions and 28 NUTS 3 regions. [NSI classification](https://www.nsi.bg/en/pages/classification-of-territorial-units-for-statistics-in-bulgaria-nuts-61)

1. Which children belong to each Bulgarian parent region in the requested edition? boundary
2. Does the assembled hierarchy reproduce the official membership and counts without duplicates or omissions? measurement

Dated national crosswalk

Record the evidence for each administrative correspondence and its validity period; preserve the distinction between a statistical grouping and an administrative institution.

1. Which official correspondence links this region to Bulgarian administrative units or EKATTE identifiers? provenance
2. Is the relationship an exact territorial match, an aggregation or a partial overlap at the relevant date? boundary
3. Can the requested administrative records be assigned directly, or does the correspondence require additional evidence? action

Traceable region geometry

Associate each geometry with its classification edition and publisher's release metadata. GISCO distributes NUTS datasets by edition with metadata and release notes. [GISCO NUTS distribution](https://gisco-services.ec.europa.eu/distribution/v2/nuts/)

1. Which NSI or GISCO release supplies the polygon, and which NUTS edition does it represent? provenance
2. Does the polygon express the publisher's statistical boundary representation or a separately established legal boundary? boundary

Scale-aware spatial use

Evaluate the coordinate reference system, generalisation, topology and area convention before using Bulgarian regional polygons for spatial decisions.

1. What coordinate reference system and generalisation scale govern this boundary representation? measurement
2. Do gaps, overlaps or coastline conventions affect the requested location assignment or area calculation? boundary
3. Should a location near a regional boundary be resolved through a finer authoritative dataset or an administrative crosswalk? action

Use-specific effective date

Record which date controls each use. NSI reports national approval of NUTS 2027 in February 2026, while Eurostat gives 1 January 2027 as the classification's validity start. [NSI classification](https://www.nsi.bg/en/pages/classification-of-territorial-units-for-statistics-in-bulgaria-nuts-61) [Eurostat overview](https://ec.europa.eu/eurostat/web/nuts)

1. Which regulation, national order and statistical guidance establish the relevant transition dates? provenance
2. Which edition does the intended statistical release or mapping task require on its reference date? action

Change-specific correspondence

Represent predecessor-successor relationships through documented membership changes, distinguishing recoding from actual changes in territorial extent.

1. Which official correspondence establishes the predecessor and successor units for each affected Bulgarian region? provenance
2. Did the change alter only the name or code, or did constituent territories move between regions? boundary
3. Can observations be transferred exactly, or must the agent obtain finer data or an explicitly estimated allocation? action

Geography-qualified observations

Require each linked statistical series to declare its territorial edition independently of its observation year, including any retrospective recalculation.

1. Which NUTS edition underlies the series, including historical observations republished on newer boundaries? provenance
2. Are special allocations, missing values or coverage differences excluded from the regional totals? boundary
3. Can the observations be aggregated directly, or do rates and averages require compatible denominators? action

Supported regional conclusions

Keep territorial comparability separate from substantive regional performance and programme decisions; require the relevant programme source before attaching eligibility to a Bulgarian NUTS region.

1. Could a reported change in regional performance result from changed territorial composition rather than changed conditions? measurement
2. Which programme decision, period and NUTS edition support any claimed funding eligibility? provenance
3. Should the requested comparison proceed, be reconstructed on common boundaries or remain unresolved? action

Check these first

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these check these first hold for the sense of NUTS statistical regions of Bulgaria this model covers, and on what evidence? provenance

Kinds and varieties

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these kinds and varieties hold for the sense of NUTS statistical regions of Bulgaria this model covers, and on what evidence? provenance

Identifiers and schemes

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these identifiers and schemes hold for the sense of NUTS statistical regions of Bulgaria this model covers, and on what evidence? provenance

Standards and regulation

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these standards and regulation hold for the sense of NUTS statistical regions of Bulgaria this model covers, and on what evidence? provenance

Real-world use

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these real-world use hold for the sense of NUTS statistical regions of Bulgaria this model covers, and on what evidence? provenance

Failure modes and hazards

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these failure modes and hazards hold for the sense of NUTS statistical regions of Bulgaria this model covers, and on what evidence? provenance

Regional variation

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these regional variation hold for the sense of NUTS statistical regions of Bulgaria this model covers, and on what evidence? provenance

Neighbouring kinds and how to tell them apart

Recalled without web access and unsourced; every item is a lead to verify.

1. Which of these neighbouring kinds and how to tell them apart hold for the sense of NUTS statistical regions of Bulgaria this model covers, and on what evidence? provenance