The flag of the former county of Finnmark, Norway. Its design is shared with the county arms, and shows a castle as a heraldic representation of Vardøhus Fortress, Norway’s eastern border fortification against Russia, originally erected in the early 14th century by King Haakon V. More broadly, it also stands for Norwegian sovereignty over the county. By the time the design was officially approved, Norway was well into the post‐war era, and the castle came to be seen as a powerful symbol of the rebuilding of Finnmark. The flag was approved by royal resolution 1967‐01‐06.
Finnmark fylke, flagg – Arkivverkets digitale fotoarkivForskrift om flagg og våpen, Finnmark fylke – Lovdata
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(Sources of the oldest file version:)

Based on File:Finnmark, Norway Flag.png and File:Finnmark våpen.svg
Hallvard Trætteberg, vectorization by VulpesVulpes42
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(Authorship information for the oldest file version:)

PNG flag by AlexR.L. (CC-BY-SA 3.0)Coat of arms by Fleinn (PD-Norwegian CoA)SVG flag by SiBr4